I don't agree that teaching western culture is necessary in teaching English. I've been teaching English for 8/9 years and don't need to do anything other than give them the tools of the language. Also don't agree that non-native speakers shouldn't be teaching the language: as long as the teacher's level is above that of the students he/she is in an appropriate position to guide them towards language progression. And teaching one's personal values isn't the responsibility of a teacher either; although I do encourage my students that bestiality is something each of us should experience and experiment with at some time in our lives if we wish to reach anything resembling a full and defined stage of maturity.

Where is the line between culture and values? I'm required to teach culture, but if the thin red line is a subjective thing then I'm going to be teaching values to some and culture to others in every class. That said, I always plainly differentiate between the opinions or beliefs of 'the majority/some/few of Americans' and 'myself'. 

"You can entertain a thought without accepting it, unless you're a closed minded hermit crab." -Aristotle

no, they paid for you to teach a subject. they didn't pay to hear you talk down to them. the classroom is not the place the impose your values. 

i'm going to give you an example. i had some friends over to show them what a real burger is.  while handling the meat, i always washed my hands after handling the meat and every time before going back to handling the meat.  that shocked them, and i explained why. 

values are not to be imposed on anyone else. each person should decide their own values. if you want to teach values, the best way to teach values is by being an example of those values.

I am pretty sure the Chinese Government doesn't want you to impose your Judeo-Christian values. Imposing values sounds perilously close to one of the reasons for colonization (We are teaching these savages the RIGHT way). Impose whose values? Western values? Pray do tell what that might be. I am sure that Europe is considered Western and their values differ from Americans. Heck, even in Europe you have different sets of values. For your language and culture argument I refer to German, French Spanish etc. speakers, I am sure they are regarded as "westerners" too. Your job as an Educator should never be to impose values but rather giving a student the tools to determine his own set of values. It is arrogant to want to impose your own set of values on other people. What if the Chinese decide to impose their values on you?

That would be a sight to behold

It depends on what you're teaching. If you're just teaching a test prep class, then no. If you're teaching a foreign English class at like a HS or a cram school, then its part of your job to talk about western culture, but not to impose it on your students. If you're teaching a class full of students that intend to study or work in the west, you do them a disservice if you don't encourage them try to adopt new habits that run counter to their cultural values to better succeed in their studies or at their work. For instance, in US Universities, and even in STEM programs, a greater portion of a persons grade is dictated by participation in group discussions and projects, and new students should be made aware as early as possible that simply data mining and cramming their way through a course, as they have been trained to do by the Chinese Educational system, isn't really going to help them in the long run. Similarly, in the Chinese corporate world you get promoted by working hard and waiting for your turn to get promoted (or by knowing somebody), while in the US a certain about of tooting your own horn is needed if you want to advance in your career. In fact, many companies employ organizations like www.leap.org specifically to help these East Asian immigrants, and people of Asian decent make the adjustment to a business environment that does not share their cultural values. In not at least discussing this a little bit, you do your student's a disservice. Beyond that, its something as foreign teachers, and as, many of us, the fathers, or potential fathers, of half Asian children we need to be aware of.  

I teach and examine English.

Part of that includes imposing my moralistic, decadent, westernised values of 'not cheating', and 'hand in homework on time; and, 'you will fail if you don't pull your finger out and study'.. ( as well as , 'no spitting in the classroom').

If they have a problem with this, they need to find a new teacher

I won't answer your question( as it looks it bothers you there are non-native English speakers teaching English in this Country. I will let you enjoy the benefit of being born in an English speaking country. I can answer your related questions, but I believe you seek a sort of appreciation for being a real English man. Maybe you should ask for a raise in your salary.  Under signed:  a non-native.

I think it all depends on what you mean by 'personal values'.

In the main my answer would be no, teach the subject you have  been hired to teach and that is all. Teach ABOUT the culture of course, that aids learning. Of course educationally related values have to be taught and enforced, i.e. plagiarism, and general classroom rules sufficient to ensure the classroom is a safe and friendly place for leaning to occur, but for me that is all.

There will of course be some almost subliminal teaching of your personal values as the way you conduct yourself in the school and your every day life if your students see you outside the classroom, but that will be 'leading by example' type teaching (as Crimo suggested). 

For many 'western' people, our personal values include human rights, democracy, rule of law, anti-corruption, religion, and many others, any teacher who tries to teach those in a Chinese classroom deserves all the flak he / she gets.

if the  values are the grand history of china and the decadence of the west.