There are definitely some pompous jerks that try to use the term true fan to try and manipulate people into agreeing with them. But at the same time, I'm not so certain I can say there is no such thing as a true fan. This is just my own opinion and viewpoint on it. Yes, you can like something and it technically makes you a fan, but if you don't like or care about what makes it uniquely it's own then I do question the loyalty of that particular fan. It's not about being an elitist snob, not for me anyway.
Hmmm, how should I put this. Ok, like a guy that wants to bang a lot of hot girls. He likes her but at the same time he'll dump her once the next hot chick comes along. There are a lot of people that just play DmC because it's the IT game right now, as long as they make it fun to a point, it's enough for them. They hardly care or don't care at all for the characters and the story or what the company does with it. But with, "True fans" the standards may be different. I've seen many anti DmC folks say that the game isn't so bad by itself, but as a DmC game it fails.
Note that this is just my opinion, it's not meant to offend anyone. If you want to play the game then play it, no amount of criticism should stop you from playing it .