I get what you’re saying but I made friends with my coworkers specifically because they were able to acknowledge how lucky we got

I think it’s fine to have your own biases, because you’re human, and also to be aware that you do, so when you encounter people who are completely out of your normal sphere you will listen to them. It’s folly to pretend to be free of imperfections (or even aspire to that). Nobody’s above human nature, and there’s no reason we should be.

Making friends mostly at work anywhere causes issues of selection bias, but it doesn’t matter if it’s work, school, church, your local pub, whatever. Balance in most things, as usual.