I don't think it does, just that some are more vocal than others because a large percentage of young people identifying with ethnicity may have something to prove and are seemingly under their parents thumbs/religion most of the time. Going wild and expressing themselves on-line is perhaps a sort of outlet?
Which may not be the case for those from multi-generational well established UK families who choose more unorthodox ways of dress/makeup/tattoos/music etc. for expression.
It could be said that the latter are not as socially inept or insecure and tend to have more social freedoms, are not sexually repressed and don't have a grudge to bare against historical colonialism etc.