Well, Yuyuko does tease Youmu canonically. However, it's not "lol lets make youmu a butt monkey for the lulz." Usually, there's a lesson to be learned in the process. Youmu is at once both the dead serious, infinitely devoted samurai, and the classically moe clueless and inexperienced girl. So you end up with things like her chapter in CoLA, or her fighting game scenarios.
As for Kanako, I don't think the "raaaagh smite teh youkais" is anything personal. I see it as more of having to do with being a god of war. Like any other god or youkai, she gets her strength from belief. And what does a god of war do to get people to believe in her? Admittedly, these were entirely the wrong people to take that approach to.