It's what this whole thread is about though. People take frustrations in their own life, be it medical or otherwise and project them on to people they think less of. That's why people yell at baristas, or berate cabbies, because there are stressors and difficulties in their life that are too much to handle on their own, so once in a while they feel the need to take it out on some innocent bystander.
Takes a lot of strength to put your anger in the right place. Not everyone has that and nobody has it all the time. Doesn't make it ok though.
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