I was once on a panel on the work of Ken MacLeod, and Ken was in the back row of the audience listening quietly with a smile on his face. He didn't say anything at all, and when I asked him afterwards what he thought about it, he said "It was very interesting, I certainly learned a thing or two." I only aspire to be that gracious about reviews and criticism, but I think it's the right attitude to have.

Also, I once beta-read something for someone who replied with a variation "no I didn't" to "this bit didn't work for me", which reminds me of Z saying he hadn't kicked me, honestly.