I'm really proud of the Friday Night Funkin community for getting so huge and well known, but unfortunately it's had the very-much-expected effect of causing some problems in the community.
Communities always have this issue that the more massive and appealing that they get, the more likely they're going to start to draw attention from sketchy people and people with bad intentions. It happens all the time; look at League of Legends, Overwatch, Undertale, etc.
Because like, FNF is SO well known at this point.
I just hope the creators manage to not acknowledge the toxic fans and just keep doing the thing they're passionate about because they are doing a phenomenal job so far.