Director gave the answer hismelf, from comicbook.com
“There was actually a scene that we cut from the movie where big Groot
was dancing to 'Livin’ Thing' by ELO,” said Gunn. “And it wasn’t such
an elaborate dance. It was more that he was just moving up and down
like this, and Drax was dismissive and gave him this look like he was
a loser when he ...