Quoting Vodka Knockers:" Honestly, this is really all over again the straw that broke the camels back. I don't like it, but I've ... [snip!] ... just absolutely incapable of going about things tenderly right now. I can't get my brain to function like that if I tried."
i would hate it if someone nicknamed me clown.
even if they dont mean it in a bad way it would always feel like an insult to me, so i can absolutely understand the way you are feeling here.
so yea...id suggest to wait until you have calmed down, do not respond to the FB stuff and have a face to face convo with the guy when you are calm again and explain your feelings.
make sure you keep reminding him about how great the family makes you feel too though so he wont feel like its an attack.