This is just a repository of inspiration to help you insult people politely. Sometimes a "fuck you" is inevitable, desirable or just inescapable. But oftentimes a witty comeback can cut deeper and give you extra points for sounding smart.
Will I sound stupid if I use these in real life?
Where did you get all the content?
From the internet. Places like Reddit, 9gag and others have plenty of ideas. I just put them all together.
Can I suggest new sentences?
Yes, please do! Drop me an e-mail here: firstname.lastname@example.org.