I'd be pissed as hell, especially if it's linked to something messed up like Nazism or similar.
The NSFW and memes in general are ok unless it's something real weird. But that controversial stuff ain't happening.
I don't care what people do with fanart or fanfics. Its outta my hands, so i instinctly make sure most, if not all, of my characters are 18+. They're fair game.
But when someone's trying to attach some messed up ideology to my work or use it to spread some propaganda of any kind, I draw that line and will fight them.
They can make their own crap for that.