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 P-N, 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 P-N, irrevocably losing the lead. It's just one of those things.