While he actually did say that quote, the context of this meme completely twists what he meant. The meme frames it like a rich guy gloating over the poor, but Warren Buffett and his late wife, Susan, have always been outspoken leftwing progressives.
He wasn't bragging about a victory - he was calling out inequality as a problem that needs fixing. As a conservative myself, I don't agree with his stance on progressive taxation policies, but by misframing his quote like this, you're actually shooting one of your own progressive allies in the foot.