I feel like if you scroll through any area outside of the fediverse you will here MASTODON SUCKKKKS OMG I HATE IT SO MUCH, it’s gonna fail. or comments saying mastodon will only exist for another year tops. Keep in mind I know in terms of microblogging apps for the fediverse mastodon is not the best, calckey is likely the best but most people only know mastodon
I haven’t seen a lot of hate on it coming from regular people, but rather from those who try to cultivate an audience online. Content creators, influencers and others alike seem to see mastodon (and potentially any decentralized system?) as worse because it inherently prevents them from being guaranteed to be reachable by the whole community all the time (in case of defederation for instance), or to migrate their following along when switching instance