That is public perception of what Stroman, we have no idea internally.
When a member of the Cubs F.O. came and spoke to Humber, he talked about the Epstein No D-Bag Rule and said there is probably just 1 in the org that still fit the profile and he'd probably be moved that off-season (this was after the World Series win). Someone straight up asked him if it was Baez. He laughed and said he's probably the most liked guy on the team and one of the top 3 leaders in the clubhouse (Heyward, Ross being the other two). If you search Baez and dbag there are hundreds of hits. The public really seems to dislike emotional players who seem to enjoy themselves.