Please help this guy is causing lag and has a very bad name

Hello. So, me and my boyfriend were playing on the Official Delta Server (Derby) when a guy with the username of “■■■■■■” joined the game and began repeatedly spamming the walk mode button, which continuously spawned in at least 20+ of the models. The server began to lag horribly, with the ping reaching a top of 300ms and our FPS basically not existing.