What your alluded to is just plain common sense, and now doubt the OP felt no need to point this out, as that was not the subject at hand. You seem very negative and prone to try and one up people no matter the post. Shame on you for that.

Of course it's common sense, but when we get Turino boasting about how brave he is, smoking wherever he wants to, Silverboy complaining about morning classes, and insulting his T/As, perhaps it's time for a little reminder.
Respect is the subject at hand, and I have seen more than my share of badly dressed, unshaven teachers. I have been to dinners, hosted by local City Governments, at 5 star hotels, and have been appalled by the number of Foreign Teachers who turn up, dressed in grubby Tee-shirts and jeans. That shows lack of respect. So, if you don't respect others, how can you gain respect for yourself?