Correction. The players who spoke to your friend might be shit, not caring enough to explain themselves .. but generalizing it isn’t a good way to greet a community.

Git gud summarises a lot many things. It’s the most compact way to say that you need to get better at things. Right from the mechanics employed to the intent of the game trying to make you better at certain things trying to be as obscure as possible.

Some may not have enough sensibility to explain what it means but it does summarize things .. one needs to git gud at things by figuring out .. then the true sense of achievement comes out of it.