Your bassist definitely sounds like a frustrated guitarist. Most 'true' bassists I've known have been quite eager to fit into the overall sound around them. Of course, they generally haven't been playing through guitar gear.
Actually, I take that back--in my old old band the bassist played through my Carvin 4x12 rig because we were all broke college kids and couldn't afford new gear. But I was playing guitar through a 1x12 combo, so it wasn't a problem. Of course, we sounded like ass no matter what gear we were playing through.
In your situation, it sounds to me like either your bassist needs to get a new 'tude or you need to get a new bassist.