[lmm]

There are over seven billion people on this planet. Knowing all of them as humans is simply impossible. To function in the modern world we have to be willing to categorize, to make snap judgements, to, putting it bluntly, be prejudiced. I mean you could pick who you talk to at a conference (say) at random, and there's certainly value in talking to a spread of people. But ultimately there are people you'll gain more or less from talking to, because your interests and theirs align or don't. So you'll look at superficial characteristics like what they're wearing, because that's all the information you have to go on, and you'll try to make the best guess you can about who would be best to talk to. And it's inevitable that you'll sometimes get it wrong. But there is no alternative; making judgements based on incomplete information is just life, all we can do is try and make those judgements as well and as fairly as possible.