I guess there used to be some sort of rivalry between Jon and Axl in the 80s but I think it's Jon who bashed Axl more than Axl bashed Jon. I think Jon said once something like "I wouldn't piss on him if he was on fire" ...or something like this.

Axl made that "suck my dick" comment in 87 but I remember reading that he once even defended JBJ at a Howard Stern show when Howard started trashing JBJs Superman tattoo.

Jon also said some nice things about Appetite for Destruction in a sort of interview he had together with Joe Eliott for Kerrang. They were saying something like Hysteria, Slippery and Appetite are the best rock albums of the 80s and all the Poisons and the Warrants suck...

Jon's comment last year when he called Axl a "mother****er" came at some point when Jon was in a good bashing mood. I think his victims were The Darkness, Madonna, Tom Cruise and Axl...to name a few :P