Why do people on reddit seem to hate Lemmy/Mbin/other federated link aggregators?

I was just reading this post https://old.reddit.com/r/selfhosted/comments/1gmv76n/is_reddit_going_to_remain_the_primary_space_for/ and many barely see the fediverse as an alternative and they seem to have a negative bias towards it. Super ironic when it comes to the self-hosting community. Yes, some instances are problematic, yes, some devs might have had problematic views. But it doesn't really matter when it's federated and FOSS. I think it's clear-cut that the selfhosting community on Lemmy is a perfect alternative to reddit. Why is there such a negative bias?