Sometimes when you meet your idols in person, they do not live up to the image you had of them. REO Speedwagon is my experience with this phenomenon. Talented, iconic classic rock band but one band member in particular is a raging asshole. It changes the way I think when I hear an REO song come on. On the other side of this, some acts i didn't have an opinion of, i became a fan after having a cool experience with them.
I enjoyed the Grammys this year more than some but my preferred music has guitars and drums, so many of the acts were a miss for me.