Is pessimism hereditary?

Is your glass half full or half empty?

We all know people who believe their glasses are half empty. Right? I might even be guitly ever now and again of this myself but for the most part the glass is half full for me.

When you say, "Have a good day!" They say, "It's already a bad day, I don't think it's going to get better." Or when you say, "I hope you feel better." They say, "I doubt I will any time soon."

People like that are exhausting! All I'm going to say is I sure hope pessimism is not hereditary because if it is I'm doomed.