From my experience, kids can be some of the cruelest people just to fit in/be funny/feel superior at the cost of others. It’s a part of your past and you can’t change that, but you can change who you’ll become. It’s not easy being a good person and you’re going to have tough choices to make, but it’s the right thing to do.
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I do understand that abused kids have a higher tendency to abuse others and that is a more complicated issue that this statement does not pertain to.
I also concede that there are kids that never grow up, unfortunately.
I and 12 others at this moment do. If that doesn’t help, then imagine a group of thirteen of us, in person, where your joke made the whole group laugh.