The best example I can give is to talk about Lynyrd Skynyrd. I loathe Skynyrd. They represent every negative cliche or stereotype about the South that you could come up with. They're the soundtrack for every asshole driving around with a Confederate battle flag and a gun rack in the rear window of his pickup. They're the music of every inbred POS who wants to roll a [insert slur here] in the parking lot or who feels personally victimized by that [slur] in the White House. They're the dull-witted swagger behind every prick who's going to go home and crack a cold one and beat his wife. "Sweet Home Alabama" is blasted from the windows of every useless, racist, entitled fraternity you can find. They're the setup for every moron at a concert who thinks he's being hilarious by yelling for "Free Bird." They're inextricably linked to a multitude of awful cultural phenomena and I don't need to hear another Skynyrd song as long as I live.
But I would never presume to argue that they were a lousy band. The original lineup was as tight as it gets, they wrote some great songs, and sadly, they deserved much better than they ultimately got.
But the Dead were just fucking terrible. Every criticism leveled at that band sticks for a reason. Flashes of inspiration were the exception rather than the norm. 90% of the time it's interminable, unlistenable dreck.