People can be mean. Sometimes they might try to insult you even if you did not cause them any harm.
Here are 3 funny comebacks that might be useful:
Someone: “FAIL!”
You: “No one asked you for your life story.”
Someone: “When I think about you I feel sorry for you.”
You: “Well…I do not think about you at all…”
Someone: “You are ugly.”
You: “Excuse me. I am not a mirror!”
Source of picture: https://pixabay.com/en/crazy-irate-angry-mad-upset-3126441/