Weird username

Hello, i saw the plugin wich stops people from having weird usernames and spaces in there name,
but it requires the permissions thingy wich i don't understand how it works

so.. is there any other way u can kick players with spaces in there name?

Minecraft stopped joining from servers with names like so, when was the last time you saw this?

I did it last week when testing my client on a lucky random server

It works on servers with shitty auth plugins. Get xAuth and it won't happen.