It's not a joke. When you become a tripfag, you go against what makes this board so great, and that is the fact that people say things without preconceptions on who they are because of their identity.
When you're anonymous, what you say and do is for the community, not just something to make you feel more important in some way.
Getting a tripcode is simply an act in egotism. It's you wanting to be noticed because you think you're so special.
In short, you're an attention whore and shit up the board the moment you put on that tripcode. So stop doing it and start actually being an enjoyable anonymous like the rest of us.