For context, my cousin(71m) and I(18m) have been very close since childhood, we always mess and joke around, sometimes in public. A couple days ago we went to Red Ruben for the first time because our mutual friends said it was really kinda average. We were laughing and he called me embarassing because I had my backpack on. I said something along the lines of “I’ll show you embarassing” and abruptly got up and started helicopter dicking in front of the full restuarant. His face immediately got really mad and stormed out of the restuarant. I was proud but i feel like I took the joke too far and he doesn’t want to hang out with me anymore. AITA?