I drive a Titan, but I am under 50 and not particularly serious, so I don't think it was me. But I do think you handled it with surprising grace.

For reasons I don't really understand, I attract periodic spontaneous male rage. It happens with enough frequency for me to realize I am the common denominator, though. Which is odd, because I am exactly what I appear to be; a middle aged Dad with limited situational awareness and no particular desire to fight people. The last time it happened was at the Bad Ass Pizza in Johnstown a couple years back. Eating dinner with my family. There was another family in the booth behind us, with a two year old who couldn't stop messing with my five year old. I was mostly oblivious to it, and told my own boy to just ignore him and eat his food. A few minutes later, young hipster Dad is standing at my table leaning in my face. Says my boy told his boy he was going to come over to his house. I thought he meant my boy invited himself over for a play-date, so I chuckled and said 'you want to exchange numbers?' I couldn't figure out why Hipster Dad suddenly turned red and got closer to me. Figured he just had personal space issues. Turns out my boy said 'If you don't quit kicking the back of my seat and putting food in my hair, I am going to come to your house and beat you." I apologized for my son's threatening behavior. But that wasn't enough for Hipster Dad. He starts screaming that his son is only 2 years old. I say mine is only 5, and frankly I think he showed the maximum self control a five year old could be expected to exert in a challenging situation. Hipster Dad asks what am I going to do about this? I say 'well, I'm not going to have him publicly flogged. I think I'll just wait until you leave and then buy him an ice cream'. At this point, the waitresses are standing nervously near the table, and all eyes in the restaurant are on us. Hipster Dad is red as hell, shouting obscenities at me, and his wife is looking mortified and pulling on his arm to try and get him out of the store. I tell him he's doing a fine job of demonstrating conflict resolution skills for his child, as well as everyone else in the restaurant. Manager comes over and asks him to leave. We get free pizza out of the whole thing, so it wasn't all bad. Just very strange.