Not all these autism mums making Robbie Williams' diagnosis all about them... ohh that's not real autism, he has a career and is famous and can speak, I have to watch my son banging his head on the wall How do you know that Robbie Williams doesn't bang his head on walls? I have level 1 autism and I bang my head on walls. Maybe he does too. I mean Sia sang about it... Also maybe the reason your son bangs is head on the wall is because you're pissing him off. Most times I've banged my head on the wall it's because my mum did something to piss me off that she knows pisses me off but chooses to do it anyway