I think his point is: it's ironic that you're criticizing people for posting one-off thoughtless comments when you assumed this woman was a bad person from exac

I think his point is: it's ironic that you're criticizing people for posting one-off thoughtless comments when you assumed this woman was a bad person from exactly one isolated event that she apologized for, knowing nothing else about her. You then tried to justify this by saying "well she probably did it more than once." This is the definition of a one-off thoughtless comment. GP told you to read the whole article carefully because it provides evidence that what you're saying might not be true.