@CaptainUnikittyFreak I cannot help you in concerns to other places, but NG is very protective of their artists - regardless of their skill level, if that's something you're worried about.
If somebody writes an abusive review (or PM), you can report it with the little [Flag]-button. Just make sure you're not reporting somebody over a difference in taste - but likewise: Somebody who complains at length about 'you not catering to their personal preferences' can get lost.
Most other hosters of art (especially NSFW) have similar means of defending against "un-constructive feedback" (to put it lightly), although I'm hearing DeviantArt and Instagram are "not the best" at actually following through.
Yatsufusa
Did those people elaborate on 'why' they were browsing NG with disabled filters then?
The fault here lies not with you but with them. If 'they' had filtered out "A"-rated submissions, they would not even have seen the drawings in question. To me it sounds you were targeted. (And if you were to write a PM with their names to TomFulp, it might turn out that they were targeting a lot of NSFW-artists...)
CaptainUnikittyFreak
This wasn’t actually on here but yeah yesterday I was feeling horrible since I was in some server with not the best person on it but they kept pointing out stuff about my art. It was too much for me and I got scared they might harass my accounts