Jimulacrum
Flush
"That guy bets too much" isn't a good reason to uninvite someone from a game, and it sounds like that may be Player B's entire argument.
But you never know; maybe there's more to it. I'd ask Player B to have the other players he's allegedly speaking for to give their two cents before deciding anything. If it really does boil down to them not liking his style of play, that's their problem. If there really is a conduct issue, that's a whole other can of worms.
If it turns out there aren't actually other players complaining, and Player B was just exaggerating and threatening to leave to get his way, sounds like you have a conduct problem with Player B, unfortunately.
But you never know; maybe there's more to it. I'd ask Player B to have the other players he's allegedly speaking for to give their two cents before deciding anything. If it really does boil down to them not liking his style of play, that's their problem. If there really is a conduct issue, that's a whole other can of worms.
If it turns out there aren't actually other players complaining, and Player B was just exaggerating and threatening to leave to get his way, sounds like you have a conduct problem with Player B, unfortunately.