Most Helpful Guy
Hard to answer without situational context. For the most part, it would be as a joke. Its best you take it as this. Otherwise you're the 4th wheel of their clique and the "Gomer" to be made fun of, which doesn't seem the case since you said "friends".
Most Helpful Girl
it just sorta depends. like if y’all call eachother bitches as in like “heyy bitchh” then it’s probably a joke. but if they are saying that to make fun of you then smh get new friends