I don't think you understand the word prejudice.
Prejudice: noun
"preconceived opinion that is not based on reason or actual experience"
Except that there is an entire thread full of evidence of these people thieving, trepassing and leaving behind unsanitory conditions. As I said on an earlier post I've met quite a few and one of them attempted to steal my mate's dog in Victoria Park. They also interupted my son's football club training when they were at Southwick Leisure Centre and caused so much disruption there that anti-caravan devices have now been installed.
Apart from that carry on.