Sevastian has been backed into a corner, yeah, he's going to lash out at people being illogical. He hasn't insulted anyone but Bowie and Kiyth, who used the same weak poop jokes.
I prove that how? I am strengthening my duchy, and thereby strengthening the realm. That is simple logic. It isn't my job to care about your duchy, Pike. This isn't some kind of cuddle fest. Sevastian is not a cuddly fellow (unless you are his wife, Jonsu Himoura). Sevastian maintains his lands, and Abbigal maintains hers. Them working together determines how the realm progresses.