Oh, crazy about Joker and Harley.
Hello. In Harley Quinn (an animated series), at the headquarters of a group of supervillains called Legion of Doom, one supervillain comes up to another and starts talking in the mess hall.
Scarecrow: Oh, crazy about Joker and Harley. I heard they tried an open relationship thing, which everybody knows only works for gay men.
Bane: Your idle gossip distracts me from my master plan.... (he then explains his master plan)

In the previous episode of the series, Joker and Harley break up.

I wonder whether "Oh, crazy about Joker and Harley." means "Oh, everyone's crazy about Joker and Harley." or "Oh, I'm crazy about Joker and Harley." Could you tell me, please?

Question

Oh, crazy about Joker and Harley.
Hello. In Harley Quinn (an animated series), at the headquarters of a group of supervillains called Legion of Doom, one supervillain comes up to another and starts talking in the mess hall. 
Scarecrow: Oh, crazy about Joker and Harley. I heard they tried an open relationship thing, which everybody knows only works for gay men.
Bane: Your idle gossip distracts me from my master plan.... (he then explains his master plan)

In the previous episode of the series, Joker and Harley break up.

I wonder whether "Oh, crazy about Joker and Harley." means "Oh, everyone's crazy about Joker and Harley." or "Oh, I'm crazy about Joker and Harley." Could you tell me, please?

Answer

Here 'oh crazy about Joker and Harley' actually means that what they did (trying an open relationship) was crazy. A longer way of saying it could be 'oh, did you hear about that crazy thing Joker and Harley did?

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