Me and my brother are going to a holocaust museum and I'm going to yell that he's a nazi while we're there.
Do you think that's going to be funny or something?
Not really, I just want to get under his skin. He is really emotional about the museum.
You may not understand why he's so attached to the museum but calling him a Nazi there is in terrible taste and just wrong. It's incredibly insensitive to both him, the people in the museum and holocaust victims and survivors.
I looked it up and shouting nazi is only wrong if you're a antisemite.
I highly recommend you don't do this. This is highly insensitive towards the Jewish community. Not only are you gonna embarrass your brother but you will also hurt other people that had to go through these atrocities.