I understand FSUES is a real thing, I really do. But really, it's rude to tell your users, "patches welcome," then let their patch languish or ignore it.
Why not say what you really mean, "go fuck yourself, I don't care about your problem, and am not interested in any fixes for it?" It's really about as polite. I'd argue it's more polite, since explicit is better than implicit.
I would say OpenBSD gets this right, more or less, even though Theo de Raadt is an autistic wanker (to quote Captain Sensible, "I may talk a lot of shit, but this time I'm right! [Theo] is a fucking wanker!"). So does Linus Torvalds. :P