We care about IRC usage that may be problematic (children picking fights with other children). The attitude portrayed in, "that.stupid.bitch.got.0wned.us" for example, does not reflect the attitude of our target audience. You see: people with that attitude, tend to attract DDoS attacks by picking fights. Having to mitigate DDoS attacks caused by children removes available resources for mitigating DDoS attacks against things actually worth mitigating DDoS attacks against. Yeah, I said that too. And, I stand by it.
Don't like it? Feel free to take your business elsewhere.
If you want to school me on "how IRC works" I should mention that I have code in basically every major IRCd and many mainstream IRC clients (the only exception coming to mind would be mIRC, actually), and wrote one of the two mainstream services implementations from scratch. I think I know how to tell what IRC users I don't want to deal with. Is it a form of profiling? You betcha. But, you see, it works... and I have over a decade of experience dealing with high-risk IRC users. Be glad I'm willing to deal with them at all.