<human>: Give me the gist of the text in a nutshell

This is a little thing, but has been bugging me for years. He just went on a rant about this today when I was watching him repair his car.

Every single time my dad repairs his car he heavily implies I am an idiot and "helpless" because I do not know how to do this. Then he rants how it would cost me hundreds if not thousands of dollars to change my oil/replace the battery. After that he rants that doctors and lawyers and scientists are all idiot because they do not know car-repair/electrical wiring/plumbing and how people always respect their elders because they are more intelligent about everything by default.

Now Dad, there are a few things you do not understand. First, we live in the information age. If I need to know how do something like change the car battery, then it's not that hard. I can learn how to maintain cars when I have a car.

Furthermore, I have absolutely zero interest in cars and I do not own a car or use one (university student - I only use bike or bus and will for a few more years), so it is not high on my priority. I do not want to watch you repair cars everyday while you lecture me on all the little details that I will forget.

Finally, nobody is an idiot simply because they do not know something. You wouldn't call Einstein an idiot because he didn't know how to wire a light-switch off the top of his head. I wouldn't call you an idiot simply because you do not know how to repair computers. 

Really Dad, it is incredibility insulting to me and others. Please stop looking down on people for not knowing how to repair cars off the top of their head. That would be like me looking down on all people who have not been trained in photoshop. Yes photoshop training could save you thousands of dollars because you do not have to hire a designer for everything, but nobody is stupid because they do not know the program. 

Academics take the brunt of his rants. He also has the double standard of never complaining about women. (Though that may be because he seriously thinks all women are already evil, manipulative idiots.)

Okay, thanks offmychest. I feel better now.
<bot>: Dad never stops ranting how people (me) are idiots and helpless if they cannot do basic car repair. Fails to make distinction between intelligence and knowledge. (ex. people can learn car repair when they need too.)