Insulting comments, even jokingly made, can often be hurtful, and in your case pointless. If you like a guy, why insult him? There are other ways to flirt. You could, instead of insulting him, compliment him. You could give him a cute wink or blow him a kiss. I'm willing to bet that any positive form of flirting will bring you better results than jokingly insulting him.
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It's always best to be kind and respectful in your interactions with others, especially someone you like. Instead of insulting them, consider using lighthearted teasing or playful banter to show your sense of humor and build rapport. Remember to be mindful of their feelings and boundaries when joking around.