Gyspy and Traveller marriage on tv show?

I was watching them, they look cool and fun with big dress/ makeup but
it went too far. Sorry if I am asking a dumb question or mispelling it
.I never have learned a lot what Gyspy really is or Traveller?

It seems that a lot ppl are very frustated and angry want them out!
They prejudice as if they are gay. What did they really do? Please
explain to me in detail...