It is okay if I'm going to argue with my mom's boyfriend?
Oh no, why on earth is this even a question? You want to argue with him?
No I don't want to argue with him, but I'm afraid if I tried to talk with him about this he'll want to argue with me.
You should try talking it out first. You shouldn't start an argument for no reason and if they do you should try to defuse it if you can.
I'm going to be hurt either way. It doesn't matter. I hate arguing though, at the same time.
Rudeness will prevail in any argument, it happens all the time. Talking it out is more polite and gets things resolved easier. It is also less stressful afterwards.