no but like in this scene is Bart is literally three feet away from the person destined to betray the human race, the person he’s spent his entire life fearing and hating. He has to keep up the pretense of simply being a cheerful, energetic tourist from the future, while in actuality he’s here to find out all he can about his buddy Blue to prevent the Reach apocalypse. That’s why he was in Jaime’s locker in the first place. Not to steal a bag of chips, but because he needed to find out anything and everything he could about him.
And here, where he’s listening to Jaime talk about his insecurities of being Blue Beetle, his expression actually betrays his emotions for a few seconds. It’s in this moment that he realizes Blue Beetle isn’t as bad as he thought, that there’s something in him possibly worth saving.