Worf has a serious chip on his shoulder whenever it comes to Klingons not living the Klingon way. After all, he didn't have the benefit of a Klingon upbringing, he was mostly raised by humans, and has been overcompensating ever since.
This. I bet Worf was so excited to have some klingons looking up to him that he just couldn't help himself. That said, this is one of my favorite Worf episodes because it is so "gray." Worf and Tokath are both being intollerant with Ba'el being the commonality that helps them see that.