No, that really isnt the worlds best insulting.
Go to a realm that has an insult contest, like arcaea did. You find things a lot better than simply stated poop jokes. At least change up the delivery, it makes Bowie seem like he's a pissed off 10 year old.
"Duke Sevastian, you hold to your titles and your lands so closely that I am unable to tell where one begins and one ends." - yes, that is rather the point. It's also quite historically accurate.