I'm going to try to be nice to loud people at the library but then yell at them
What is the basis of your thinking for this? Why do you need to make a ruckus in the library?
when I was in high school our class came back to school at night after dinner. When everyone was done eating, the teacher said it's time to learn math. Every1 put their food away, but one guy still chewing loudly. The teacher kept asking him things about the math. Finally the guy started yelling at the teacher
I get you are annoyed about loud people in the library, you are being as dumb as them for yelling back. A library is for study and quiet time, not for loud fighting. Report them to the front desk instead so it's not your problem.
*starts yelling* BECAUSE I'M MAD!
It is best to react calmly when you are irritated. Yelling makes it worse and then you are also breaking the rules for yelling.