Dad always snaps!

Every single time I talk to my dad, he snaps at me! I am so tired of his BS. He makes me more cranky than I already am. No matter what I say, he just snaps. The only time he doesn't is if I just say i'm headed to the store or the gym. He doesn't seem to care if I say something simple while he's out in the garage like that, but whenever he's in the house, he just snaps. I am so tired of him flipping out every time I talk to him. And he wonders why I never want to talk to him. Duh! Maybe he should learn to talk to me at a normal level!