This is a potential for a great learning experience as you are going to continue meeting these types of people throughout your life.
Things to remember.
One, you aren’t going to change their behavior.
Two, even if you were to resolve this issue, you will only find comfort until the next person annoys you.

Learn what it will take for you to become comfortable in this situation.

Am I saying you need to work your entire life around everyone’s poor behavior?

What I am saying is you have two options.
1 – Change all the people in the world who are annoying which could be a HUGE number of people.
2 – Focus on changing just one person (yourself) to induce behavior which makes you find piece when having to deal with people like this.