I wanna talk about this scene, specifically about Kaminari's reaction
This was after Shinsou's explanation of Brainwashing where he says that he needs a response to control people.
So what does Kaminari do? He physically prevents himself from replying to Shinsou. As if Shinsou would immediately use his quirk against his own teammates.
I think that this was a nice subtle way to show the kind of prejudices that Shinsou faces with a "villainous" quirk like Brainwashing. And that even people in class 1-A are not immune to certain assumptions.
(It was still a dick move though)