why are boys so dumb?? (help needed)

ok so here the situation..

i went home early after hanging out with chris. he tells me he’s hanging out with one of his guy friends.. i see on fb that he’s hanging out with more guys and a girl that i SEVERELY dislike and dont trust because of her personally hurting me in the past and bringing alll kinds of stupid drama(chris KNOWS this).. and theyre drinking…

i ask him about it and express my displeasure at the whole thing and he’s acting like i have no right to be upset?

do i? i let him hang out with whoever he wants whenever he wants and i know it’s not my choice to make and i’m not the boss of him or make him do what i want but dont i at least have a right to express that i’m upset??