Why do some people see all flaws in other people but never in themselves?

Anonymous
My sister and I once used to be close but due to personal life decisions, that changed. One specific life decision that I made that sort of deteriorated our relationship, I expunged it from my life and after doing it and seeing as though my sister and I wasn’t as close anymore and didn’t talk much anymore I figured it would be a good thing to make amends and at least hang out again and catch back up and in so little words she told me she didn’t want to be bothered with me but tried to be nice about it by saying she needed space. I didn’t pressure her and I left it alone. I no longer stay with our parents, she still does but recently I came to my parents house to stay a few nights, they have a extra room for that reason and my sister didn’t speak to me or acknowledge me. I’m not the only person she’s done this too though. One of our cousins that we were both close with at one point also made a life decision that I suppose she didn’t agree with and felt as if it was a disrespectful decision to make and he did the same thing I did, tried to make ammends and figure out why she was upset at him and she blew him off as well and still no longer talks to him but my thing is, she doesn’t always make the best life decisions or choices either. She doesn’t always do things we agree with but we never cut her off the way she does a lot of us in the. It’s like she feels she’s perfect enough to judge someone’s character enough to say “I no longer want to speak or deal with you ever again.”
Why do some people see all flaws in other people but never in themselves?
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