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My parents used to stand next to me while I answered the home phone acting me being nervous was a normal thing. They didn't seem to connect that I was nervous because they'd give me a spiel about talking on the phone afterwards. 
Similarly my Dad would have a go at me about a firm handshake and looking people in the eyes and such things. 
I have met people with high flying careers with confident demeanours and their parents are a lot more relaxed and lead by example, not authority. 
I think my parents were too desperate to make sure I didn't turn out like them that they ultimately inflicted the same sins upon me that their parents did upon them. Many such cyclical cases.