Those techies are often poor in their hometown. Many of them got a student loan, went to college, graduated in CS and then looked for a growing job market. Their own hometown offers maybe half the salary and some don't have any jobs at all.

They became rich the moment they entered the bay area. So hating on the "rich techies" is really misguided and will only further increase inequality.

Pushed out is a misnomer, really. If you have a booming housing market you should invest into more housing. These "rich" people will take the luxury apartments in 3 story buildings and the existing residents can keep their housing.

These things are not mutually incompatible. You just need to give one side what they need and they will leave you alone.