Ditto Mira: this time he got the information from the teacher that the behavior was unacceptable. I usually let my son's actions be my guide as to how to continue. If the same thing happens again (being silly, disrespecting the teacher, wasting class time goofing around) then yes, there should be some a follow-up consequence at home.
I came from a generation which learned that when you sassed a teacher, answered back, weren't following the rules, were a problem for the teacher, then there was most certainly a consequence for that at home. For second offenses, this is how we parents back the teacher up and support her.
If it were me, I'd also check in with the teacher and get her opinion on what happened if you haven't already. Sometimes kids will downplay their own part in something. As a parent, I like to make sure I have all of the information.