I'm only answering this because I wanna answer this.
#1
Someone: You're so mean!
You: I'm not mean, it's just that you're an idiot.
#2
Someone: How come she/he gets way more fans than me while she/he is the idiot and I'm the diva?
You: Then that explains a lot; you're the idiot.
#3
Someone: Am I really that nerdy?
You: [Imitating.] Hi, I'm [his/her name] and I'm so nerdy. I have no style!
#4
Someone: What does sissy mean?
You: How come you don't know what sissy means if you are sissy?
#5
Someone: You are really annoying.
You: I am annoying; but at least I'm not as dumb as you are.
#6
Someone: Hey [your name], what time is it?
You: I'm not your clock!
#7
Someone: Hey everyone, [your name] is stupid!
You: Hey everyone, I may be stupid, but [his/her name] is more stupid!
WARNING: Only say these insults/comebacks if that person says one of these quotes. If you say this without someone saying it before you; you're in danger.
1. Someone: You're fat.
You: Yah, I'm fat, but your ugly. I can diet.
2. Someone: You're such a bitch!
Me: A bitch is a female dog. Dogs bark. Bark comes from trees. Trees are nature. Nature is beautiful, so thanks for the compliment.
3. Me: Im not rude. I just say it how it is. The truth hurts.
4. Someone: OMG, Im so ugly!
Me: Yes. That's why you have 97 photos in an album called 'Me'
5. Me: I see you suffering from a lack of vitamin ME.