1. Calm down
2. Ask is they have ever actually listened to weezer
3. Ask why they don't like weezer
If the answer is stupid like, the music just sucks then to 4, if the answer is actually a good answer the to 5.
4. Run away and hide or duck tape them to a chair and make them listen to 'let it all hang out' over and over till they like it
5. Ignore them till they give Weezer another chance.
You can't convince someone that weezer or any band is the best band ever because people just don't change their minds like that. So all of these rules are pretty much useless! yay! ;D