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Actually, Keith said something like this before, except he was more diplomatic. I read an interview he did with Rolling Stone back in the late 80s, and he admitted that he didn't like Springsteen's music, because he thought it was just too overblown. However, he did say that he hated to admit this, because he considers Springsteen a friend, and he also said he's a really nice guy too. I'm sure Little Steven already knows about this, so I don't think it's going to be too much of a shock to him.
BTW, in David Marsh's Springsteen biography, he wrote that Keith did like Little Steven's work with Southside Johnny and the Asbury Jukes, so maybe that's a consolation prize for LS.