Cant disagree with it if those are clearly connected or can be connected to former war crimes...
I dont know in what kind of wars UAE has been but if we had a player from an "opponent" country making some remarks only trough a t-shirt about those wars the owners wouldnt take it lightly for sure.
It should investigated tho are these really only used in a bad political sense or are Bosnian too sensivite and the pure hate towards Serbians works here, but certainly it would have been lot more clever to enjoy and celebrate without all of these.
Flags are no problem at all, but political messages dont have place in football especially not ones that can be connected to wars.
Kolarov actually had some problem last year maybe with a fan and with some flag if I am correct but not much happened about that.