Why are some people so rude all the time?

So, long story short. I was trying to be nice to someone regarding a relationship that didn't work out for them and they started bombarding me with trying to hit on them. And then I was asking for Medical advice for a friend who had medical condition and then someone started saying go ask your doctor. Obviously the doctor isn't available all the time and that's why I asked on his behalf. And then there was a guy on Facebook who said I was subtly trying to impose my views on him when I just was being nice in my conversation.

Why are people so rude? I mean if I can't help why not just mind my own business. That is to say if it was just difference of opinion it would be a whole different story but it just seemed rude and weird 👀.

Why are some people so rude all the time?
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