One of my kids piped up with, "hey miss, did you know that the *horrible hate group* is coming here to rally against *an upcoming proposition*?" Which led to an animated discussion about what proposition he was talking about and such. I didn't want to squelch the discussion, but we had 10 minutes left or so, and I had to finish showing them a particular process. So I said, "we should all be tolerant of other people (except hate groups, of course), whether or not they are like us."
We were getting through our process, and I'm hearing a bit of rumbling & talking about tolerance. Then, after one such discussion, a kid pipes up with, "miss, R___ is lactose-intolerant."