It must be Pearl Jelly cuz Pearl Jam don't shake like that. There are these subcultural "conformity mindsets" which sometimes spread like viral wildfire in which people decide to share the same opinions about stuff. It's just a thing that happens.
I love Pearl Jam bashing.
Prrof positive that a band can try hard to do everything right ("Jeremy" video excepted) and there will still be legions of people to bitch and whine about them.
U2 deserves it, but Pearl Jam (who Im not really a fan of) has to be one of the more genuine, honest and real megagroups in rock history. But whatever.