A term used amongst players of the Guilty Gear game franchise to describe the actions of a person who, in their eyes, is choosing to complain about the game and its features rather than improving.
Originates in reference to the round into speech, with the full line being "Mankind knew they could not change society, so instead of reflecting on themselves, they blamed the beasts"
As such, it's also a way of telling a person to go reflect on their style of playing and reconsider themselves.
"How is Nagoriyuki high tier? He actively kills himself when using his tools?"
"Bro is blaming the beasts"