He joins other people’s worlds and destroys the projects that other people have built.

It’s extremely frowned upon, especially because people often spend an incredible amount of time and dedication to build incredibly elaborate projects… and then a griefer shows up and blows up the entire thing.

I’m a little bit surprised that the parent commenter is so nonchalant about admitting that he’s a griefer, since that will get him banned in a lot of servers and because it is definitely not socially acceptable, even online