Why can't a woman and a man be close without people thinking they are in a relationship?

Why cant a woman and a man be close without people thinking they are in a relationship?

It's one of the things that irritate me the most. I work closely with a woman, we go out to lunch, carpool once, and for some people this means we are in a relationship. This is a mentality straight out 1800.

To the guy that made the joke, I just said that it's not true, and even if we were having something, I still didn't see how it could be his business. That shut him up.

Why can't a woman and a man be close without people thinking they are in a relationship?
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