How to stop my friend from building swastikas in our minecraft world?

My friend has been pestering me for a long time to get into classic minecraft, we started a beta 1.7 world a few weeks ago and have been enjoying the simplicity of it all. But the problem is that he constantly goes on rants about how woke new minecraft is and how its better to play the good old versions before they were censored and ruined and now he's building swastikas around the world and its kind of bothering me. He told me that its tradition in old minecraft to do this because of servers like 2b2t. What can i do?