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Everyone has their own battle and challenges that may influence their behavior.
Value your self-worth, external criticism should not bother you, raise your self-esteem from within.
Separate your worth from your mistakes as both are not linked with one another.
Accept the fact that it is not possible to please everyone and meet everybody’s expectations.
Be an unbiased observer to gain a balanced perspective.
Think and evaluate criticism, know whether there was any truth with the statement and then work on the feedback for positive growth.
Try to look for other reasons for one’s behavior. If someone doesn't greet you doesn’t mean the problem is you, they might be shy or distracted.
Understand other rudeness as their behavior reflects their own issues and has nothing to do with you.