Fanbases-
Normal- Usually either waifufags that love Lopunny/Meloetta/Whitney or whatever or naïve people who catch the first 5 early route shitmons they find and make stuff like Raticate and Unfezant into lifelong bros.
Fire- engaged in faggoty starter wars, move along
Water- Engaged faggoty starter wars as well
Grass- Also engaged in faggoty starter wars, but extra whiny because they think they're type is underpowered (it isn't)
Electric- Mostly okay, but a lot of them are in it for the cutemons, so in normal places (not 4chan) they're likely to be actually sticky-handed annoying gross little children.
Ice- Whiny like the grassfags, somehow think buffing Hail to raise defense will save them (it won't)
Fighting- Waifufags and baracunts abound, they think too much with their cocks
Poison- Usually okay, I've not met too many though
Ground- Usually okay
Flying- Some waifufags, but not as many as Normal, Grass, or fighting
Psychic- Obnoxious genwunners or okay people that are bad at the game. Some waifufagging as well.
Bug- Annoying fucks that think they're types is too weak (it isn't) and won't stop whining until bug is the strongest
Rock- Usually okay, but Lycanroc might be attracting a bad crowd
Ghost- Obnoxious hipsters and waifufags
Dragon- Either whiny fags who think their favorite type is useless now that fairies are around (no, it's still pretty good) or actual disgusting little children. Small amounts of waifufaggotry present too.
Dark- Some edgy dudes but mostly okay, edginess isn't bad in small amounts
Steel- Elitists who lord over everyone thinking their type is the best. Most likely to think everything is objective and their opinions are facts (they're not)
Fairy- Actual fags or actual children. Most just came for Gardevoir or Sylveon anyway.
In Conclusion: Poison fans are probably the least cancerous since there's so few of them and the ones that are around are generally okay.