I'm thinking of ditching a class just to not play a strategy board game with a guy I always thought was really annoying
Why are you judging people harshly?
If you really knew him, you would see how much of an irritating guy he is.
Even if you find a classmate annoying, it is wrong to ditch class. Skipping classes can hurt your grades and you have a responsibility to attend.
I don't care about that class anyway.
Classes are there for you so that you can get an education and function in the world, so blowing off your class is wrong and it is only hurting you in the end. Take your education seriously and don't throw it away over silly things like avoiding classmates.