Possibly people speak out against the quality of Endwalker's story because there are a lot of concrete things to point to in its structure and use of plot devices like time travel and memory wipes instead of relying on strong characterization. I imagine the poster you responded to was also frustrated because the FFXIV community has on numerous occasions treated players badly or insinuated things about their character for liking the antagonist factions.

G'raha Tia is quite literally a character who regressed in terms of his writing quality and by the end of Endwalker was robbed of all agency. He is a comfort character with off-putting qualities that no longer contributes to the narrative in meaningful ways. I don't care if people want to make fanart of him baking cupcakes with the WoL. Just don't waste my time with that nonsense in the MSQ.

No other character is forced onto the WoL like this in the story. I imagine if they did something like this with ARR Thancred that sectors of the community would deem it "problematic" yet the red-headed catboy gets a free pass it seems.