Can someone PLEASE explain the ambiguously gay British concert hooligans?

I've been to, like, five concerts this year, and at two of them (Starsailor last month, and the kickass Radiohead-esquely dissonant Modest Mouse concert last night) there were a pair of intoxicated and muscular young British men with several orders of magnitude too much enthusiasm. In both cases, they threw their arms around, groped each other, and pushed each other into the crowd every five seconds. The problem, as you can imagine, is that in a crowded concert venue, bulky Brits blindly falling in every direction are incredibly distracting and scary. Where's security when you need them? This time, they nearly picked a fight with some people before wandering to another part of the venue. Thank goodness.

But the question is - what's up with this weird trend? (Sarah said the same thing happened to her at another concert, and everybody knows three examples make a trend.) Is this standard concert behavior in England? Are gay men in England so repressed they take it out on American concertgoers? Is this some sort of death-by-a-thousand-cuts terrorist plot? Someone please clue me in.

Update: Dolapo says the same thing happened at the Goldfrapp concert, but he's too lazy to post. Also, I forgot to clarify that the thugs at the first concert were not the same as the thugs at the second.