Allow me to inform you that I know this guy on a vaguely casual basis.
He is being facetious. He is being lighthearted. He's not trying to be an asshole, neither am I nor the other man who replied to you- but you certainly are.
Perhaps you think you're justified, but, given that anyone with common sense, passable English literacy, and two minutes could verify that that comment by ~
DestroyErase was an ironic comment without a hint of malice toward the intended recipient, you're pretty quick to fly off the handle.
Calm down before you end up embarrassing yourself in front of an asshole. God knows I did at your age.