For me, the key *isn't* to avoid anything that's negative. For example, it doesn't do me any good to deny that we're in a bad recession, and that that creates challenges in business.
My crucial task in not to *become* negative. In other words, I can look on the inputs in my life and make decisions about how to act on them (or not) -- without resorting to sarcasm, snark, bitterness, etc.