what happened in my second per. algebra 2 class

so this girl sits down ans says hi to two the two guys that sit next to her

guys: dont say anything

girl: uhh you guys are supposed to hi ___ how was your first period

guy1: hi ___ how was your first period ( he says sarcastically)

guy2: hi ___ how was your second period

later...
Mr.___ ok the answer is 306
guy3: hey did you get tht
guy4: YES I GOT THAT!
guy3: ok i was just asking

girl : see guys why can't we talk like that