I hate people sometimes

I'm in school to be a teacher and today I went first in presenting my science lesson plan for my teaching science class. The lesson plan was for 1st graders and we did does it sink or float. We are supposed to do the lesson for our classmates. You would thing grown people would act like adults. But this one woman decided she wanted to test me. Mind you she's a student. Not my instructor. She's my classmate. Same level as me. Not the boss of me. She decided since realistically not every student would do the lesson she decided to be that one student and instead of doing what I said she put the block in her mouth. My professor even asked what she was doing and she said "Remember. Every kid won't do what they're told." Then this grown ass 30 something almost 40 year old woman gets on her hands and knees and starts crawling and then bumps the table and one of my things of water spills. My professor herself is just staring at her dumbfounded. I hope that doesn't knock my grade. I hate people.

Edit: I should probably add that she didn't do this with anyone else. Not with the people who went before or after me. She just did all that weird shit when it was my time