I went to the local primary school, then a local comprehensive (a formerly well-regarded state grammar school that had deteriorated since going 'comp' and deteriorated further during the time that I was there in the early 90s). The pupils were a 'mixed-bag' to say the least. I was fortunate to have supportive family and some mates who weren't nutters.
I did know a few people from private schools through rugby and got on with them fine.
I went on to an 'old' university and met more people who had been to private schools. Again, it wasn't a issue.
I've no problem with fee-paying schools, but I won't be sending my offspring to private schools unless someone gives me a lot of money. I've not the cash to back up my pseudo-middle-class-ness 😉