I took out a girl I met and her friend for drinks and I told a friend to come join so her friend doesn't get too bored. He brings himself and his friend. I give her a lot of space to interact with my friend and his friend and I act pretty chill. My friends friend ends up hitting on the girl I like when I'm right next to her talking to the other girl. And I can tell he's throwing a shit load of pua material on her. He ends up getting his phone out and says we gotta go to whatever place they were discussing sometimes and just tells her to add her number.

Although it was up to her to give her real number or not I don't think she's into him. It just bugs me he just comes in knowing that's the girl I'm into and hits on my girl. I personally wouldnt hit on a target that's a friend of a friend out of respect to my friend. Am I overreacting if I hint to my friend to not bring that dude around me?

Your asking a values question which has no correct answer but I wouldn't hang out with a guy who isn't giving me a reasonable modicum of respect. I wouldn't say anything to him at all, why bother.