It’s pretty hard for me to choose just one word to be banned from general usage. There are so many that I’d like to ban.
There are all the words related to meaningless social customs,
and all the words used to lecture us about caring about our reputation at the expense of truth (you’ll get to hear those all the time here in South Asia at least),
and then there are the words used by rich arrogant people to show that they are so much better (another proof of their lack of brains),
and there are words used by American (or in fact any other) media to justify any nonsense America (or whatever country it belongs to) does,
and then there is the f-word and all its derivatives.
But most of all I’d like to ban the word ‘whatever’. It’s amazing how so much arrogance and apathy can be contained in an eight-letter word. You have all sorts of insignificant teenagers belittling your serious talk with that word. You have all sorts of fat good-for-nothing rich people throwing that word at you. You have apathetic frivolous people using that word when confronted with any serious situation that affects others. Hence the word should be banned.