BLM sometimes need the group to position right so they don't have to move to optimize. This makes a lot of BLM act like this for everything which is wrong. Also the BLM should think on the group as well, the strategy shouldn't only favor them but should favor everyone as well on top of helping their positioning. People playing BLM and not thinking about the team and just not wanting to move even when they can move just piles up into the "we hate BLM" thing you commonly see in PFs. Myself included, I honestly dislike having BLM players I don't know in my pick up groups at PF. They are usually really bad.