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When you see a profile, I think you subconsciously categorise them as a certain type of person. And you're no longer talking to an individual, but one of many people you've previously put in that category. I think it's a coping mechanism to dealing with large volumes of people.
Yeah, I was having similar thoughts recently, many people seem to argue at ideas without a specific person having them a lot. I guess its hard to see the humanity behind a icon with a weird name.
