t, that Wulbren being mean to Barcus was to drive him away and out of danger. I do think he is annoyed that Barcus is so adamant against killing the Gondians, but I also think he still does like his friend.
I thought it was because he is trying to distance himself from his former self and Barcus is sort of ruining the image of the strong, tough leader he's trying to project to the Ironhand Gnomes. Like if someone is trying to be the toughest guy on the block but their mom keeps taling about how they saved little birds as a child.