Are periods a joke to guys?

Lately, I have noticed guys make comments/jokes to girls like "Your on your period aren't you." If a girl really was on her period, what would make you assume that? Is it her just acting rude, because anyone can be rude at any given time. I don't really act any different from how I normally do on my period. It's like every time I get mad at someone some guy that thinks he is funny will end up saying/ loud whispering to people "she's on here period", or "she's PMSing". Just wondering if this happens to anyone else or have seen people do it? If you have did you mind them saying it or not really?
Who cares about this stuff, it's just a joke.
That's kinda offensive and I don't know why people do that.
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Are periods a joke to guys?
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