How would you react?

Recently I was on a high school mission trip. I forgot a towel so I just dryed off with a sweatshirt. I thought it was no big deal and my roommate and I thought it was kinda funny. The next day my roommate decides to tell a group of guys on the trip about it. I couldn't hear if they said anything but I thought it was really awkward and then they all looked at me, but their faces were normal so I couldn't tell what their reactions were. How would you react?