He got his explanation. However, prior to the question, he was spamming the stream and being transphobic. Here's a partial confession of the event.
imgflip.com/i/8j9k9u
Also, regardless if the user name is a joke or not, it's disgusting. I have distant relatives who fought on the nazi side and even family who was already in the USA that fought for the Confederates. I'm not proud of that fact. I can't imagine the harm they all caused. I try not to think about it too hard... And I feel bad for any Jewish people who have had to see the current username or any people of color who saw the old user name. There is a rise in the number of neonazis and I have very little patience for racism EVEN as humor.