I'm going to hang out in the bathroom at the airport
Are you having stomach trouble?
Yeah, I was really excited about the trip, but now I feel pretty ill and my stomach is making rumbling noises.
I'm sorry you're feeling sick, especially at the airport. It's okay to use the facilities when you need them. If you don't properly take care of everything now you might have an even bigger problem on the plane, and cause yourself and others a lot of problems.
Are you making fun of me?
No, I'm not making fun of you. I am trying to sympathize, and let you know that it's fine to take care of any stomach ailments you have now, by staying near the restrooms.