Why are some kind people so witty and savage?

I never understood how a sweet, genuine and loving person can roast hard.
I have a cousin who’s like that but she’ll only be nice when someone deserves it. She can snarky a bit and very witty but she’s actually a sweet person once you get to know her. She has amazing comebacks and very feisty but she’s a sweetheart. She’ll tell you off if you’re being disrespectful and will tell you the truth even if it’s painful. I actually get shocked when some kind people aren’t as nice as people think. She once roasted the crap out of her best friend. Man she was MEAN.
Why do some sweet people hide their feelings or sweetness by sarcasm and feistiness?
I’m so nice and I have no mean bone in my body. My family and friends says I’m too nice for my own good.

Why are some kind people so witty and savage?
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