I suppose that if the prosecution wanted to prejudice the jury against the “ victim” they could ask that his character and past behavior be made an issue. They’d be stupid to do it. It isn’t necessary for the defense. Rittenhouse had no idea who was endangering him. Only that he was endangered.
Those are the facts of the case, but in a jury trial you always want to bolster your defense by appealing to their emotions.
Hence ... you can be damn sure that Shorty Rosenbaum's "Shoot me, nigga!" rant before the shooting will absolutely be shown in the courtroom.