Don't trivialize it as some personal preference around moods. It's much more than that.
Stuff like death threats, doxxing, child porn, harassment are not just "moods you don't like".
That is the wrong view on a global communication platform. It's like saying "a certain tone sets the mood for the entire telephone system".
These things should be seen more as silos, subcultures or whatever.
Unless you expose yourself to the firehose of globally popular content.
Anyway, analogies are imperfect, please look in the direction where I am gesturing, not at my exact words.
The point here (and of the entire conversation) is that you shouldn't judge a medium by its worst imaginable actors as long as you're given the right tools that allow you to use that medium undisturbed, effectively putting them into a different silo. Today twitter allows a very crude, imperfect approximation of this by following people that post decent content and setting the homepage to "latest posts" instead of "top tweets". Ideally we'd have better tools than that.