It's not fun at all, it's cynical. You can criticise a film and have fun if you actually watch it properly instead of trying to pick out hundreds of nitpicks that generally involve forgetting what happens in the film or the franchise.
And I can be a pretty cynical *******. I know it when I see it.
They actually do though.
Plenty of people will regurgitate the same misinformed "sins" that CS mention rather than engage in an actual discussion.
CS aren't the only Youtuber at fault for harming actual discussion either. There's loads of Youtubers that harm discussions on various topics.
"CS said it's a sin therefore it's bad"
"Egoraptor said Sonic sucks so it sucks"
"Ghast said Peri is bad so she's bad"
Those aren't people's own proper opinions.
Yes this is more so an issue with people being too lazy to make their own opinions but it's not helped by lazy content creators who make terrible points and criticisms.