See, where I’m from, a carbomb is a cocktail made from beer and hard liquor. We’ve got Chicago carbombs/handshakes which is Malort and Old Style. I’ve even had a Mexican carbomb with tequila and Modelo.
Coffee liqueur and beer isn’t really a thing where I’m from, in the heart of corn country. So you’re the one drinking milk shakes at the bar as far as I’m concerned.
Maybe instead of being a dick to people because of where they happen to live, you could try to learn about cultural and regional differences.