To all you people emitting your bodily gases out there.?

OKay why do you do it so proudly? I was at my friends house and my friends brothers fiance lets out this MSIVE burp and doesn't apologize and I almost screamed it was so loud! I am not saying I don't do it but I don't belch or fart upon people!?!?! IT"S DISCUSTING! I mean if it's an accident oh well but that's discusting! So why do you fart/belch upon people? What is your reasoning?