Xhekaj is the first player under MSL tenure that he's expressed public frustration with. That in and of itself is a red flag. Coupled with the comments of Arber saying he's gonna try and meet with the coaches more like some of the other players is also a little bit of a flag.
This isn't Therrien who threw anyone and everyone under the bus (except Desharnais). This is a coach who is fairly reserved about public comments. So something is definitely up with Arber that isn't jiving with the coaching staff.
Of course, because fans are so obsessed with size, they presume that Arber is hated because he fights, but it's very reductivist. He hasn't really been better than other d-men that have rotated in and out of the lineup (Kovacevic, Barron, Harris), but he also hasn't been worse to be the one who is mostly out.
I definitely think there is something more at play here. Also, any fans thinking arber has played well enough to warrant a regular spot is being delusional. You don't get to play regularly just because you're big and can fight.