This was 10+ years ago, but I was surprised by how many Brits hated Top Gear when to me and a lot of other non-Brits it was just the funny British banter car show with the three cartoon characters

i was shocked to go online and see mountains of hate for The Last Jedi. i thought it was amazing

Eggs

Compassion and empathy for animals. Yeah, they say they like it if you don't have any follow-up questions, but things go downhill real fuckin' fast after that.

The ending of How I Met Your Mother. Like, it was certainly no cinematic masterpiece, but I felt like it was a very logical build-up and delivery. I don't get the impression that they really stretched the story for more seasons either (yes I know they did add more things to stretch it, I just mean I think it doesn't show story-wise). But even a few days ago I saw people complaining about how bad the ending was, and it's a rhetoric I see almost every time the show is mentioned. And, again, it is not a cinematic masterpiece by any stretch, but I wouldn't expect that from a sitcom anyway.

Battlefield Earth. I saw a schlocky sci-fi movie. The internet has since informed me it's the modern Birth of a Nation or something.