I don't get it

If you really were Simon Cowell, you'd be rich enough to have your teeth professionally whitened after every meal, and this wouldn't be a problem.

Well keep cleaning them or you won't have teeth to stain.
I recommend not drinking tea, coffee, wine and other staining food/ drinks. Brush your teeth with baking soda to help remove the stains. Also go to the dentist please

For the sake of the people who know you, don’t stop brushing them. If you are worried get some green paint and cover your face in it - this will distract people from your stained teeth and allow your teeth to appear whiter if it is a darker shade of green.

When drinking “staining” drinks such as cola, coffee, etc. use a straw so the drink has less of a chance of touching your teeth.