My parents raised me as an only child, which really pissed off my sister.
The Only Child
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Explanation
Explain Bear
Listen up, buttercup. This joke is funny because the person is saying their parents treated them like an only child, even though they have a sister. The sister is mad because she wasn't treated as well. It's funny because it's like saying, "I'm the favorite!" which is something only a dweeb would say.