Yeah, let's all encourage someone who is sick to go into work and stress their body further, which impedes the body's ability to heal itself. Good idea. If he is contagious, he may get other employees sick, too. But at least he is tough! Forget common sense, we all need to demonstrate what large amounts of testosterone we have. Also, he can get his coworkers sick who can also demonstrate how tough they are by working through sickness!
I apologize on behalf of my colleagues here, many of them subscribe to backwards beliefs. If you really feel gross, make the call. If you're not one of these people who skips work all of the time Management will understand, I am sure many can tell if it is a bogus call in or not.
You need to abuse call ins quite a bit as a part timer to get disciplined. That said, don't abuse that fact. If you just feel mildly sick, moving around might help. If it is worse, it won't. I speak from experience trying to "tough it out."
In summary, calling in because you legitimately do not feel well is not being lazy or weak. It is a demonstration of common sense, and respect for your body.