I think there's a significant difference between "neutral" and "diverse".
For example, Reddit is big enough that if you find yourself holding an unpopular opinion in some particular subreddit and you're getting battered with downvotes, you can probably find some other similar subreddit that's more friendly to whatever view you've got that's drawing ire. People speak derisively of "bubbles" and "echo chambers", but really, why should I stick around and try to engage with people who just don't want you around? Communities naturally tend to segregate themselves along ideological lines like this.
Here on the Fediverse the population's too small to support quite so many diverse communities yet, unfortunately. So if you've got an unpopular minority view you can end up stuck with either routinely finding yourself serving as a punching bag or just not posting. That's no fun.