Username and display name can be set independently, you should have a “Display name” field in settings. Their non-unique display name is “max” and their unique username is “@kittykittycatboys@lemmy.blahaj.zone”. If you check their profile you should see both.
If you don’t set a display name it will be the same as your username, if you set display name to the same as username (like I have) it’ll show your username without the instance even to people on other instances.
I leave on time, how is that an insult? I’d be much more insulted if someone asked me to work for them for free. That’s what unpaid overtime is.