Why does my son always lecture me? Shouldn't it be the other way around?

It's kinda funny... I was always told I'm a nag and lecturing everyone but lately my son is doing it all the time... he nags me for smoking, he nags if he thinks I am drinking too much at dinner, he makes up new rules around the house. I wonder if it's normal he acts like that.

Why does my son always lecture me? Shouldn't it be the other way around?
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