Nice try, but you're off track. Vinegar is, of course, an acid, and acids provoke sour tastes. Tomatoes are also fairly acidic, which is why an unripe tomato can taste unpleasantly sour. Mixing the two together in a salad will add a lot of acid. That would be great if sour flavors counteracted bitter ones. But they don't. So you'll only be fixing yourself a tangy, bitter salad with this solution.

Try again.