I have no idea who any of those bands are, I think I've heard of some of them though. Since the Flood was the band who was saying shit about Bane of Existence at the Palladium I think, on that Waaf show.
The guys from hirudinea, abhorred and kevorkian's angels are all total assholes, but make great music. Someone being nice isn't a good reason to go see their band.