If not doubting the ability, why make the throwing stuff down the stairs comparison, or in fact the "when guitarists could play..." remark, jest or not? It's as daft as Jason Becker fanatics claiming that David Gilmour is rubbish because he can't play 32 notes a second.
Just a bugbear of mine, "this music is shit" is fair enough in my book, but "this isn't musical" isn't, if you get me :)