The English language can get confusing since there are so many words with multiple meanings. Take literally for example. Literally can literally mean not literally. You can go ahead and read that sentence a few times. I'm still not sure it makes sense. I guess what I'm trying to say is I literally don't know if it makes sense. Or maybe I literally do. Who knows anymore.
In the case of this guy's shirt, the confusion between "computer servers" and "restaurant servers" must have left the wait staff very afraid. His shirt obviously means to reference computer servers, but when worn at a restaurant it's a confusing and poor choice. I guess it wasn't enough that this guy had to broadcast his geekdom to everyone. He also wanted to creep out everyone in the restaurant. I hope he tips well.