A friend told me that if you use undesirable language (please don't stoop to racial slurs), they'll mark your number as 'hostile'. This will propagate to other lists, removing you from them before you're even added. She swears (pun intended) by it.
Edit: it's important you don't threaten them, lest you be added to a different kind of list...
That..... that's the opposite of what I said to do
hhahahhahahahahahahahahahahaha