I briefly summarize:

Coughing by covering your mouth. Cheat as well. By the way, the destroyers of legends have long been proving that the most effective (safe for others) to cough is not the palm, but the flexion of the elbow, although the option of the cloth is out of competition.
- Put the wheelchair in public transportation with the words "Please let", and not "Paddy nits, ugly people, the queen will walk". React to this with the phrase "Do you help?", and not "Here are the minors".
People who sit in transport sit not because they are uneducated, but because they want to drive sitting. Tired, not sleeping, the leg hurts, the back hurts, little or nothing. If you think you need a seat, ask to give it up.
- To try to make you good to say "Thank you", if you don't need to, thank you anyway. "Thank you, I have to drive two stops" sounds much better than "Well and naked you, shit, stand up, hinting that I am an old ruin, it is time for the cemetery?".
- Teach the phrases: "Let me go", "Please", "Thank you", "If you are not difficult", "Be kind", "Sorry, this is I careless", "Nothing terrible", "Thank you". You are not difficult, and the interlocutor is pleasant.
Not to blame yourself.

Thanks for attention.