For me it was Circa Survive. Remember hating the vocal on Juturna, didn’t get the flow of any of it, thought it was wank - forgot about them.
Stumbled upon On Letting Go about a year after it came out and fell head over heels for them. No idea what changed but glad it did.
Show me a band you HATED until it clicked for you one day. I’m talking like, you were an out-loud shit talker and now you get it