One little thing to watch out for - if the favorite stock you hate goes up, instead of down, you could lose money, perhaps lots of money, perhaps more money than you invested to begin with. If the past year or so has taught a lot of investors anything it may be that the stock market doesn't always go up. At least not in the time frame you want. A subsidiary point is that individual stocks don't always go up. Sometimes not even in the long run.
Some stocks actually go down and disappear.
Before going further I should make clear that it is true stocks generally do rise - over time. And the majority of individual stocks do rise - over time. But there are plenty of down times in the markets and plenty of stocks that may never fully get back to where they once were. I am an optimist. Just because I am writing about shorting stocks after fourteen difficult months in the markets, I don't want people to think that I believe shorting is the only way to invest.