Now I think SAO was not even that bad.

SAO was bad, but it's copycats are terrible.

SAO was excellent here and there (Rudolph the Red-nosed Reindeer, The Black Swordsman, Mother's Rosario) and was at least decent all the way through.

It was just one of those series that became so commonly loved by normies that advertising one's hatred of it became an easy way to gain instant edgelord cred.