Why do most men belch so much?? is bugging me

My dad, older bro and cousin (guy) just burps out loud abd it bugs me so much! I have to keep plugging my ears because of it. My mom and little sister doesn't seem to be annoyed by it. Even they belch loud. People have no manners. They dont do it in public. How can that not big them. I tried to tell him but they brush me off and tell me to bug off and they can be up when they want and it's natual. My cousin's burp woke me up! Ugh! I can't take it anymore. That's why I have to have sleep music on. I get told to turn it down.