Your interpretation of sanderjd's comment was uncharitable and incorrect.[1] Saying you had a chuckle at their expense was condescending and added nothing.
zmgsabst's reply to you was rude. But it was a challenge to reflect. No one suggested you thought you were perfect. No one suggested your stumble disproved the utility of empathy. You wrote paragraphs against straw men.
Please receive criticism from others as you want others to receive criticism from you.