20 years ago if you asked an unhoused person to leave a Starbucks, the fear of police, the general shame, etc. soft social pressure might have worked. Today's street residents might see the antagonism as entertainment, their position in the world as entitled, and sleeping in the police lockup as a clever free hotel hack. It's the same sense of entitlement that has them break someone's car window for something they can sell for $10 or walk out of a store with an arm full of merchandise.
In a way, the breach of social contract has become an entertainment aspect, if not a Robinhood-esque anti-society self-justification. The consequences of "being a constructive member of society" are too high for many, and the consequences of street life are ones you can mentally harden yourself against.