Pathfinder did more damage to the hobby than any other game. There's nothing wrong with a monster campaign, but monsters are monsters. Having a Githyanki in the party is bad enough. Tieflings being so common nobody bats an eye is bad enough. Drow being completely ignored is bad enough. Half-elves and half-orcs being completely uncontroversial is bad enough. Players have gotten so used to these types of creatures as characters that there's an assumption that the narrative setting of the game world shouldn't care either, and it's one of the biggest problems that exists in D&D to me. I don't have a problem with any of these creatures as a player race, as long as they can't stroll into a town without being lynched. They're fucking monsters.
I honestly don't think this is Pathfinder's fault. The seeds of "monster PCs" being normalized probably originated in two different places; in TTRPGs, with the Eberron setting which really emphasized a world where monsters like medusas and minotaurs could just be part of the fabric of regular life, and in video games, with World of Warcraft, which has a whole faction of playable monsters that people loved. 4th edition D&D was transparently trying to catch up to WoW in its popularity, so not only did it normalize some monstrous races like Dragonborn in its first PHB, but it made a lot of traditionally monstrous races playable in subsequent books. By the time pathfinder really got off the ground in adding monstrous characters, I feel it was already totally normalized.