By older, what age exactly do you mean?
from my personal experience children start being horrible to each other around age 10 and then stops about 15, when they are a little more matured.
And also that may be just me, but I believe they are horrible just because… and not for any good reason like a stereotype or so. They may learn that “gay” or “black” is an insult so they use it, but not really caring about the meaning.
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