1) Trumpette isn't an insult, so go a head and keep using it.
2) The people can dictate quite a bit, actually. You piss off the customers, you lose your customers and your business goes belly-up.
3) It is not the same as a privately owned business in a local town. Facebook is a publicly traded company and the law is the law. Yes, you can ban people from using your company, but the CEO cannot just say, "ban that idiot" and they get banned. There is a group that decides. And if they ban you from using their product and you haven't violated any terms and conditions, you can sue the company if you can prove it.