Is it just me or do people assume things way too much?

Ok I'll admit I do it too sometimes but I try to make sure I at least have information to back up my assumption, but I just had a guy assume that I had a kid because he over heard part of my conversation with one of my friends and I was talking about my nephew at the time. Is it just me or do others agree with me?
Is it just me or do people assume things way too much?
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