A quick side note: I suspect that British people would be predispositioned to make fun of Americans more readily than they would, say, Derren. On this subject, it is interesting to note as well that Japan is a far more communal based country.
As far as differences go though, the interesting question is indeed why Blaine and Angel get laughed at in America, but Derren doesn't in the UK (or, indeed, why I referred to Blaine and Angel by their last names, but Derren by his first).
I think part of the answer lies in their material, once again, as well as their personal styles. The last thing I watched of Derren's was where he helped a man develop confidence in himself. The thing before that, it was debunking psychics. Now don't get me wrong, I'm skeptical about magic shows in general on TV. But I can't but respect the sort of thing that Derren presents. And I can't help but think that I would be happy with my life if I could help one person get over their fear like that.
By contrast, when I watch Angel and Blaine, which I haven't done for a while admittedly, what do I see? I see Blaine doing some endurance stunt with all the expressiveness of Rupert Grint. I see Angel getting someone to go down a slide - and instantly turn into a child - and I just laughed at the absurdity of the thing.
These things are (mostly) impressive - but I know who I respect more, and who I find more interesting. I can't speak on Cyril, not having really watched him perform apart from a trick or two. Angel and Blaine appear different. Intriguing, but different. Derren's performances are different, but he himself appears humble, and real. The former is of course easier to make fun of.