Breaking down some of them:
> You can't afford it? You can leave. I'm sorry, get a better job
That isn't how it works in the real world. People can't 'just leave'. If you seriously think moving to a more affordable city is an option for everyone you are sadly mistaken. I don't think I really need to go into why "just move" is very naive argument.
> "I'm sorry, get a better job."
Again, this isn't how life works. If it was so easy to 'get a better job' we'd all be out doing it.
> "This is a city for the right people who can afford it."
Who are "the right people"? Who gets to dictate who can and cannot live in a city? Many people being priced out of San Francisco have lived there for generations, far longer than people moving to work in tech. Why are the latter "the right people" but not the former?
I am not saying I totally agree with the protestors, either. Gentrification in general brings many positives and negatives. It's a tricky balance. There are good arguments to be made on either side - "if you don't like it, just move" is not one of them. "You're not the right people" is even worse.