If I'm, say, typing my password into a DCC chat window, and I get kicked from a channel, it's rather easy for me to accidentally nail half my password into the channel.
If I'm typing a line to a friend of mine, and I'm half-paying attention, the channel steals focus. I type it there.
If I'm kicked repeatedly, it is impossible for me to do anything about it. I can't type any commands, generally, because the damn window keeps popping up.
I suggest an option for windows kicked in to simply flash, not steal focus, from everything. It's irritating, and unnecessary.