This response doesn't really sit with me the right way. Even if multiple people pointed out that you had written down the wrong answer, it's pretty out of pocket to give a response like this; because as staff you're expected to remain as professional as possible no matter what the situation is. If you can't take a couple critiques then maybe staffing isn't for you.
If this is just a one time thing and won't be a problem, then I'm honestly for this application given you continue to be active. You seem like a chill and funny person who wants to help out and I'm all for that.
+/- for now.