I have a MASSIVE Cock.  That is, if you compare it to the rest of the kindergarten.
Did you ever know a person who has been assaulted or abused as a child, or have you ever been?
Yes, my kindergarten teacher raped me when I was 5.
I am very sorry that such a thing happened to you, and I hope that I can help you find the support that you need.  However, you should be able to empathize with people who have experienced such trauma.  Jokes like the one you have told could cause them a lot of emotional distress.