What I object to is the numerous posts I've seen written by non-white FT's(mainly Asian)-terribly written posts-bad English-bad attitude- complaining about this or that company

Absolutely. If when searching jobs for oral English teachers applicants can't understand that as a bare minimum they will likely need to have good english skills then I feel there is probably something wrong with them in the first place. They should also ask themselves what kind of institution would be looking to hire them without this skill?

Non-native speakers should be particularly wary of accepting a job in a large city in a developed province as these areas can usually attract teachers from the so called 'big 5 countries' and therefore the jobs that are left there are for the rubbish schools who couldn't get the native speakers to begin with. Much better heading to a smaller city or poorer province where they'll be more grateful of getting any FT they can find. However, even then one should be practical about how good a job it's going to be and adjust your expectations accordingly given that you may not have all the necessary skills.

However, perhaps it's a little short sighted to say that only native born speakers should be allowed to work as FTs. If you ask any Chinese employee at a foreign trade company who they do business with on a day to day basis they won't just tell you the English, Americans, etc. they say that they speak to Russians, Germans, people from the Middle East and so on and they do it all in English. Dealing with the little foibles of other non-native speakers is a reality that students will have to face if they choose to use their English skills in this way. Therefore is there an argument that they should be exposed to this in the classroom?