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That's a strawman though, nobody actually says that. People complain about "flip flopping" when they see a politician campaigning and he or she says one thing on tuesday, something contradictory on wednesday, and then is back to the previous position again on thursday.
Usually when I see it, it is people complaining that a candidate endorsed different viewpoints than they did during past elections (in other words, they think something different than they did years ago). Kerry and Romney both come to mind (though to be clear, both (or at least Romney) have been accused of the type you are talking about as well) . Specifically I have heard some people claim that Romney has flip-flopp…
I think a lot of that is just that if the person in question clearly does just say whatever they think people want to hear, then a dramatic change in position appears more likely to just be more of the same. Romney suddenly being against "obamacare" is a good example. It doesn't appear that he changed his mind because of new information, since he still claims his version of the same thing is great, but Obama's is terrible.