The Bottom Line
Somebody sort of annoying is bugging the heck out of you. Be the bigger person.
In Detail
Dissonance at your job or school might cause you some stress or discomfort at first, but once you accept the fact that everyone is entitled to his or her own opinion, you will be fine. Your relationships can withstand some healthy debate, so don't hold back when it comes to disagreeing with them. Just don't get personal about it.