This is an article that touches upon Lawrie being part of the clubhouse issues in Oakland, 2015. Seems he was just too high-energy, all the time, and wore on his teammates. There was some weirdness when he left the Sox, too, like phantom illnesses or injuries. Like, he was hurt, but the medical staff couldn't find anything wrong with him.
https://whitecleatbeat.com/2016/01/25/oakland-athletics-brett-lawrie-cause-of-clubhouse-chemistry-issues-in-2015/
Here's another I found that just talks about Lawrie's clubhouse problems in generalities, mostly hung on a Billy Butler quote featured in the first article.
https://www.brewcrewball.com/2017/3/4/14811690/the-fall-of-brett-lawrie-release-brewers-blue-jays-oakland-white-sox
Most of what else I found at the first page of a Google search reference the same incidents. Staring down Adam Lind for not scoring on a sac Fly where there would have been no chance. I found another where he wore on umpires, to the point where they'd call him out on multiple 6-inch-out-of-the-zone balls because he had shown them up, or something.