I'm sick of the idea that people aren't supposed to judge one another, that everybody is supposed to be perfectly neutral and objective in their opinions of people. This comes up all the time when people complain about things like racial profiling and affirmative action, and it's so annoying to discuss. We're just more open about our opinions now than we were back in the 1950s, but going around telling children (and I've seen this in my school district) that they're "not normal" for being perfectly neutral and objective towards everybody is just about as contrived as when we used to tell people that homosixuality was a psychological disorder. You should get to know people on their terms and shouldn't act on your prejudices, but for the OP, it would definitely be wrong to say that I, or anybody else, doesn't judge people now and then.
Anyway, I overestimate people all of the time. If you get one of my obscure pop culture references or are a girl with the slightest interest in gaming or graphic design, god help you. I'll never leave you alone.