You shouldn't put down others.
Greg and Zach are high school students who are both interested in the same girl, Tammy.
Greg wants to win Tammy's affection.
Greg dresses nicely at school acts kindly towards Tammy whenever he has a chance.
Whenever Greg talks to Tammy, he makes sure to mention Zach’s flaws and make himself look better by comparison.
Tammy is impressed by Greg and agrees to go out on a date with him.
Tammy doesn't like the way Greg behaves and decides to date Zach.