You can say a lot of things about Dr Light, but you can't say he doesn't love to say the word 'rape.'
Dr Light was a joke, then he was a scary rapist, then he was a lobotomized joke, and now he's a scary guy again...who loves to talk about rape.

He even gets all metaphorical talking about rape. You can start a conversation with him, and he will find a way to bring it back to rape.

Did somebody say 'rape?' You'd better believe he likes rape!

Gee whiz, dude! Why don't you just change your name to Dr Rape and get it over with! You'd think you didn't have any totally awesome super powers!

Although I will admit, this little dig is funny. I'd say it's worth having him clumsily insert a rape reference into a conversation to get this insult out:

Ha! Green Arrow gets hot for arrows! Just like Dr Light gets hot for rape!