I'm not going to my grandparents funeral
Why would you skip out on the final good bye to your grandparents?
I just don't have time for bullshit ceremonies.
It is your choice to attend any funeral. They are for the living and not the dead and if the ceremony is not for you, for whatever, reason, then that is okay.
I can't stand wasting my time on things like funerals where it's done out of blind devotion.
If that is how you really feel, the so be it. You do not have to go if that is how you really feel. You do not have to go to anything that you do not care to be at.