Is it just me or do people have no common courtesy?

Seriously, don't these people know anything about respect? Like today I held the door for some random person and not even a simple thank you or acknowledgment that I even exist! Someone does something nice for you, you show appreciation...it's not rocket science. How about when someone sneezes and and you say "bless you" and you never get your simple "thank you"? C'mon people where are your manners?
Is it just me or do people have no common courtesy?
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