Villains are awesome. If no one cosplayed the bad guy, there would be no such thing as cosplay role play lol I usually cosplay the good guy because the bad guy has things I haven't enough skill or money to do yet, but I DO one villain that I absolutely love. I play Kingdom Hearts like a madman and in 2012 decided to cosplay the boos from Kingdom Hearts Chain Of Memories. His name is Marluxia. He is wickedly evil..I showed up to the shoot (my first Kingdom Heats shoot) and I was automatically well recieved. Everyone was all "MARLUXIA FINALLY WE NEED YOU!!!!! GET OVER HERE!!" and that stuff. The point of that story is that me cosplaying a villain was more well received then ANY of my other cosplays..
Do this cosplay, feel amazing, and have tons of fun.
You WILL get the "overly extatic role player" though like mentioned. Where they will not even ask, but just start being their character..maybe a superhero since you are more of a comic villain..They will be obvious. The ones being rude are obviously doing it on purpose, it's quite easy to tell the difference, but from my experience, the more "out there" characters (armor, crazy hair, or just over all a lot of awesome detail) will be well loved