Did the show seem to promote this behavior or shed light on it?

I've never heard of sexing rattlers this way and prefer to use tail shape rather than color as the initial method. Then use tools if there really is doubt.

Idiots like this guys are speeding up evolution 10x by killing the noisy rattlers.

Only the quiet ones will be left to breed and give birth to more quiet ones.

Eventually, well get a rattler that's just like its tropical cousin, no rattles same snake.

No warning.
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The way to get started is to quit talking & begin doing. It's kind of fun to do the impossible. -Walt Disney