On the one hand, Groot shouldn’t be so disrespectful, but on the other hand, it’s funny to see him act like a stereotypical teenager.
Peter promptly tells him to put it away, but Groot sassily responds, “I am Groot.”
Still, our favorite walking and talking tree will need to get his act together once he and his allies jump into danger.
We the audience don’t know what Groot said, but evidently it was laced with obscenity judging by the looks on Peter and Drax’s faces, as well as Rocket exclaiming, “Language!”