I was at the Dell years ago when they held a reserve game there and some geezer (I'd seen him at loads of away matches and he'd seemed ok) starting giving the monkey noises to one of our own players. I challenged him, he said it was a joke, I said it was ****ing stupid and illegal, and he shut the **** up.
Simples.
Helps that I'm not the worlds smallest bloke probably, but I'm also soft as ****e.