After the best day of the year for the S&P 500 and the Nasdaq, one market bear said it's time to take off the rose-colored glasses.

"It's the Peter Pan rally. As long as you close your eyes and you believe, you'll be able to fly," Brian Kelly of Brian Kelly Capital said Tuesday. "As soon as you stop believing and doubt comes in, it completely falls apart. To me, I think you do sell this rally."