When someone points their finger in your face and won't stop, are you justified in whacking it away?

Say you are arguing with someone. They point their finger in your face while you're arguing. You ask them several times to get their finger out of your face. They don't, and instead, they move it closer and start wagging it. You whack their finger away with your hand. Did you just assault them or were your actions justified?
It was assault
Your actions were justified
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When someone points their finger in your face and won't stop, are you justified in whacking it away?
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