I don’t mean to justify or suggest being unkind as a default. In fact, I’ll take the opportunity to say to the person reading this (yes, you): endeavor to be as kind as possible as often as possible.
Instead, I recognize that some people cannot be kindly (again, from their perspective) criticized. There is no, “That was disrespectful,” which is taken at face value. When this person hears such a phrase being directed at them, they hear someone being unkind to them.