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My wife is an MD. I hang out with doctors from time to time. Yea, I've run into quite a few that seem pretty stupid. Then again, we're all pretty stupid every now and then. It just goes to show that doctors are human too.
I work in an operating room, and I have colleagues who I’d allow to dissect brain tissue with full confidence that they are the right person for the job who I wouldn’t trust to make me a peanut butter and jam sandwich. >

same thing happens in engineering and techincians fields. I have had coworker I wouldn't trust with a screwdrive near me and ones I would trust to fix or build anything.
An MD seems like a really intense technical/trades degree. >

It's a trend that high aptitude in a prestigious field can often inhibit a broader understanding in other areas. Since people like that assume skill and understanding translate cleanly instead of realizing it is hilariously inconsistent. >

Most people learn 1 field in a school and don't really need to learn anything else in life. The chance of becoming a doctor is also tied to wealth and comfort in childhood years. Middle class at least, or parents willing to financially support you. >

I didn't touch on this but the other issue is that highly specialized fields often pull away studying and attention from broader subjects.
People like to complain about the Liberal Arts or a broader approach to primary education. But the benefit is your knowledge is more well rounded (In theory at least). >

Not even in theory. Ever meet a Classics major? Holy shit,  they're some of the smartest people I've met.
Pre-med seniors? Can barely make a grilled cheese sandwich. >

I'm 42 years old and this is the first time anybody mentioned my degree without making fun of me! 
Thank you! >

Aw, all those dead languages weren't for nothing. >

My sister has a phd. She also managed to drive 600 miles without headlights. >

How do you know how far it was? >

Gps, maps,odometers... She drove entirely at night and said nothing changed. >

Is she an owl? >

On a clear sky night, with decent moonlight you actually have better visibility without the headlights, the problem is that no one else can see you.
Me and my sister call these people "The Batman", see someone driving at night without headlight "Oh shit, did you see that, it's the Batman!" >

I work in IT and supported many doctors over the years.  I once had a brain surgeon tell me he was so dumb because he couldn’t figure out his computer issue and ad to call support.  I said look man calling yourself dumb for not knowing how to get a windows machine to boot after a boot sector mess up isn’t dumb.  I am not going to walk into a operating room and look at a human with their head cracked open getting operated on and call myself stupid for not knowing that.  You are highly trained in what you do better than probably 1% of the population you are not dumb but it is humbling.