Do you not know that words can have more than one meaning? From the context you can tell the meaning. When airbus use "retard" they're using it to mean "to slow down".
It's not "these 6 letters in this combination is banned", it's "stop insulting people based on mental illnesses".
It's not "these 6 letters in this combination is banned", it's "stop insulting people based on mental illnesses".