Why do people dismiss martial arts teachers who aren’t in perfect shape?

Some people have type 2 diabetes or early stroke symptoms, like myself. It doesn't negate what I know about fighting. Also, in the heavyweight division fat and just plain overweight fighters often KO jacked guys all the time. Some people's DNA is simply not rigged to have a "V-shaped body" all the time.

I was watching a Tai Chi teaching video, and because the instructor was a few pounds overweight, some jackass joined his channel and started mocking him and saying that he was "teaching bullshito".

I watched the video, and everything the guy was teaching was sound for real self-defense.

The whole, "Everyone's a bullshito artist except your own instructor," nonsense just needs to stop.

Why do people dismiss martial arts teachers who aren’t in perfect shape?
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