Many many cases. If anyone annoys us we tend to hold grudges and people annoy us easily. So One Shot, Pseudoregalia, Silent Hill, Pathologic. To be fair I'm looking at a list we had and have forgotten why we were mad at say, Promise Mascot Agency. Uuuuuh Suda 51 stuff is borderline.

Any kind of case where the fanbase is super horny or super aggressive and or can only express their liking something by shitting on some unrelated popular thing (I think Undertale usually gets the target on these but its the shitty attitude more than the actual Undertale)