I had a very similar experience... fellow passed me when I was lazing on the flat, "on your left!" and I went by him on the next hill...same (but laughing) utterance... I think I added, "I love this hill!~" and then I cut over to the bike path for my cool-down last mile and he came up beside me and asked, "just what kind of bike *is* that?" [and it was the 7500FX, which was novel then... not the Xtra and we had a nice conversation.
So, sometimes it's not poison - but he did have to slow down and wander down the path... a serious testosteritis case coudln't have done that...