When I can I try to avoid kayakers or let them get a good surf if they're in a hole tearing it up and I can eddy out above or do a few back strokes to slow down and give them a moment more, but....
In the raft you'll get one chance to hit the wave/hole, he can paddle back up and get into it from the eddy after you've passed. He was an inconsiderate for not getting out of the way and an idiot for not avoiding the cat - imagine if you'd just mowed him over with the cat and clocked him with the aluminum tubes and kickbar?
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse