From Wikipedia: “Crab mentality… is a way of thinking best described by the phrase "if I can't have it, neither can you". The metaphor is derived from a pattern of behavior noted in crabs when they are trapped in a bucket. While any one crab could easily escape, its efforts will be undermined by others, ensuring the group's collective demise.

It seems like men's subs just devolve into pulling down any man who shows even a shred of optimism or happiness.