Can't say that I have. I have experienced it the other way round, though, where I didn't like someone, then saw them live or met them and found them lovely.
I never used to like Arthur Smith, for instance. Even 'as himself' on TV he always came across as a coarse, ignorant bigot. Then I was introduced to him and someone asked if I could give him a lift back to his hotel. I said OK, as long as he didn't mind slumming it in my dog-smelling, rust-bucket of a motor. He said he didn't mind at all. He asked questions about the city all the way back to his hotel, then when we got there and he got out, he reached back in, shook hands and thanked me most profusely for the lift.
What a nice man!