I'm not against patreon, it is a good thing.
That being said, there are two things that bother me about it.
When good artists with lots of amazing work simply start churning out pornographic fanart. Oh well. I guess sex sells.
But most of all? When people I don't know, or even have on my watch list solicit me via note to join their patreon to help fund art of (just as a for isntance) Sonic/My Little Pony slash fic art.