Emotional damage

Last night after coming back from my evening class in Brownsville, I was telling my dad about a 15th anniversary event for the Twilight franchise happening tomorrow evening at my campus, saying that there will be other activities to celebrate while watching the movie, but I unfortunately can't make it since I'll be at my Brownsville class during those times. I don't remember exactly what else my dad said but I did recall him saying "oh well, you're old anyways. Too old"....like what?🙃 I'm 20 and he's 46, who's the old one? We joke around a lot and so does my brother, so I didn't take it too personal and told him back to fuck off that I wasn't old. However, once I was ready to go to bed, I couldn't stop thinking about what he said and I suddenly got emotional. I don't know why that happened. Maybe it also added to the burnout feelings I've been having recently throughout the following weeks? I didn't take it personal earlier so why was I crying? It was weird and I just wanted to know if anyone else ever experienced something like this, not exactly the same but something else like this and how to deal with it. I don't like being too emotional.....