In work doing a late shift. A woman I know is having pizza and chicken with a friend of mine, they usually let people order in pizza or similar if on a later shift.
Went up by her desk passing to go toilet and she offered me a slice, I took a chip as I'm having dinner when I get home, she let out a huge burp, a big horrible one, said ooh excuse me, and let out another even bigger one... no effort to keep it in whatsoever
Aibu to be disgusted and to think she has absolute no manners? 
She is regularly quite vulgar in the stuff she talks about, like saying to her friends 'pick my shitty bum' if playfully 'joking'
Where do these people come from?