The behaviors of the group of guys were just every nerd/geek trope imaginable. It was just, ugh, annoying to watch.
That's basically my problems with The Big Bang Theory. I'm not sure I'd go so far as to call it "Nerd Blackface," though this isn't the first time I've heard that term applied to the show.
Granted I've only watched one episode, but based on it and everything else I've heard about it, this basically summarises it and its humour:
"We're nerds." [HA HA HA]
"The blonde girl doesn't understand what we're talking about." [AH HA HA HA]
"[Obscure sci-fi reference]" [OH HO HO AH HA HA HA]