I genuinely feel sorry for Sunderland. I'm sure they're a majority of good salt of the earth people, but there is an element amongst them that live with perpetual vitriol and it all stems from their hatred of everything Newcastle. It poisons them and their outlook on everything and everyone.
You only have to see how much they hate certain mangers they've had (if you think our -mainly light-hearted- ridicule of Wilder is bad, its tame compared to how they feel about a dozen managers they've had over the past 10 years or so). They hate their owners whoever they happen to be at the time, they hate their managers, they hate most of their own players, season after season. They also have a hatred for clubs like Luton for knocking them out of the play offs, they hate Wycombe for being placed above them by the EFL during the abandoned Covid season, and they hate Coventry for something that happened 50 years ago.
I'm so glad we don't have have that kind of mentality. Its unhealthy. But then again, their vitriol all stems from being in the shadow of all things Newcastle as mentioned, whereas our "rivalry" is more of a p!ss-taking one rather than pure hatred.
They're a club/city to be made fun of, not hated imo.