I guess I'm just less generous towards those who rub me the wrong way with how they ride. But I realize there is no rational explanation for it, although fandom, and I'm talking about sport in general, implies a suspension of reason to some extent. There is no "reason," for example, why I should wish rider x to win and rider y to lose miserably, when personally I know neither. Perhaps rider y is a lovely chap, while rider x an unsupportable douchbag? Maybe they are both fine chaps, so why would I prefer one over the other?
On the other hand, I can think of one occasion that sealed my distaste for Roglic's modus operandi, which is a better version of Valverde's (who I never felt enthusiasm for, for basically the same reason) in the mountains; it's when he stomped that guy at the Dauphine, denying him what would have been more than a hard-earned victory, when Primoz didn't need the win, being as he was already in the race lead and having gained more time on his direct rivals. After that I simply had no sympathy for his cause, despite recognizing he admirably deals with the misfortunes that have befallen him, starting with crashing in that very Dauphine, irrevocably losing the lead. It's just one of those things.