All the above, PLUS, the guy probably has an effects board the size of Ohio and 500 stomp boxes all fighting against each other. The best way to deal with players like this is to either embarrass them or just punch them in the fucking head.
Is it legal to shoot "stoopid guitarists" in the USA? I think we could call it a mercy killing... mercy for us to not put up with such nonsense.
I love the instrument but find the wacky, voodoo priestess-required, psychiatrist-optional type of player sometimes really difficult to deal with. Not because they're batshit wacky, but because they have no sense of ensemble playing and must have "their tone" even if it sabotages the gig or deafens the rest of the band & audience.
And I've said this before, but guitarists can hear stuff that ain't there when they get all misty-eyed about "my tone." I've stood with string players who can readily demonstrate different tonal palettes, even the most nuanced are discernibly different, but some guitarists hear changes to "my tone" that simply don't exist.
My NYE gig featured a very skilled guitarist who had some awesome sounds... but mostly they didn't work in the arrangements of the songs being performed. Playing by himself, though, I loved what came out of his amp. Surely there can be a balance struck.