Why do people take other people so seriously on here? Take me for example, I always get judged on my purely joke-based comments. WHY?!

Idk a Person i meet on here knows when its a joke or not and i do too so Idk

Well naturally, we as a community tend to judge other. In general, it's a natural instinct as a living being. And the community seems to be on edge these, especially with politics, slang, equality problems, and personal problems.
Unfortunately, it's difficult to counter this as an individual, but all you have to do is stay positive- it's easy for me to say, but don't let the judges get you down. :)
If you want a more opinionated answer, I'd say that not everyone can take a joke, See More and everyone has different perspectives on different issues, what amuses you may not amuse others.

Once I published a quiz on here about how gross/messy people are and everyone said it was mean, but I don't make any of my quizzes offensive. I know I sound stupid and ignorant, but I hate it when people take stuff so seriously when it's meant to be a joke. The quiz I made was supposed to be funny.

Yeah I know that too. Caps, startle me.
Or at least cussing, too. I wish people would not take EVERYTHING wrong. Ghost hugs. *^*