Do you think it is nasty that my dad walks around the house naked?

he takes a shower, gets out then walks by everyone in the house to go get underwear on! and every thing freaking hangs out and the worse part is that he is fat, not skinny. But it is REALLY nasty to me, but i have just gotten use to it now since he does it all the time! but i in NO WAY like it ! Ha that's disgusting, but do YOU think that it is so effin nasty that he should just stop, or do you think that it doesn't matter because he is just my dad..? BTW my parents aren't married they just live together, but my mom is making plans to move to vegas soon. :/