To the credit of the author and this individual post, you would have to go out of your way to come to that conclusion. That is, there isn’t anything present in the actual article to suggest that what you’re alleging is valid.

How do you tell when someone who disagrees with you is coming from a place of feeling threatened or devalued vs. a place you'd consider legitimate?

Hoping your methods are reliable and transferable, you're applying them to "a great deal" of posts so maybe they'd be helpful to me too.