As far as Roxy was concerned, if Xander thought getting drunk would help him out then she was all for it. She wasn't going to play bad cop and point out that liquid confidence usually ended up causing people to make asses of themselves, instead figuring if he stuck with her he wouldn't have to worry about that. Roxy wasn't judging him, even if she was judging everyone else.
A slight smile was offered to Xander's friend after they got the punch from him, although she didn't have any of it until they got to their destination and she had both hands free once again. Taking a sip, she winced at the mixture before closing her eyes and gulping it down, grinning at Xander once she was done. "That's good, and if it isn't we can always leave." She paused, glancing down at her cup. "By the way, you shouldn't go to that kids' parties. All people do at them is drink too much, some do drugs, and sometimes people go into closets or dark rooms and like, do it."