This seems to be unfortunately true. It's part of the same current that feeds our lately emergent hard-right movement, also unfortunate- but I don't wish to go there.
American cover bands often want to be a jukebox rather than exercise their own signature on a tune, partly because they think the audience wants that- I find myself guilty of that and lately have striven to put a new spin on a thing rather than cop the bass line, getting technical about details and nuance. What have *I* got to offer?... Being a jukebox takes the fun out of the experience on both sides of the mic.
Anyway I am not a big fan of American pop, but I do like rock n roll. I find Nickelback very annoying, but give me some Supersuckers, deep-track ZZ Top or Cheap Trick's first record, there you go.
But there's definitely an angle with Brit rock/pop that goes by/over the head of an American dive-bar audience. The cultures are pretty different.
There's a good percentage of knuckle-dragging, flag waving mindset here. On the other hand we do have blues and early rock and roll history, it's our backyard...
My .02.