Mine? As miserable as ever. My little bro wanted to go to a little comic con thing, is just not my vibe, felt surrounded by people in weird costumes is just... Thankfully I was there for like half an hour.
Then why half ass it in the first place? If you're double his age then I would expect you to have enough life experience to fake your enthusiasm, or to have enough perspective that an awkward 30 minutes with someone you supposedly care about wouldn't be worth complaining about online to strangers.