
The author never specified her characters being green or red. She already said all three of them are crazy in their own way and they going to be highlighted respectively. To my surprise, TJ stans are the ones mostly classified Jo to as a green flag or a guy without any flaw. They even made a meme comparing Jo with a lettuce saying he's too green and too boring that he has nothing exciting in him. I'm yet to see any Jo stans saying he's green.

Woah, I heard that from Jo fans first lmao. Then everyone seemed to have conquered. I guess there are all kinds of comments everywhere. Not about the lettuce or whatever, but the green. Just like all I hear from them is also the "toxic" category TJ is in. Personally, I hate these types of label because categorizing people that way is just reductive. I'm looking forward to see where all their storylines will go.
I don't think most readers understand Jo atmosphere in the story. With Jo we as readers will see how he enters this life like how Ian and tj did, it just we're seeing it from Jo perspective only, as he's never entered that life style until now. We will see his morals conflict with his desires and how dangerous he will become one he embraces those desires, his up bringing is very different from Ian and Tj so his reaction will be completely different to what the other two did. His character might actual help out BOTH Ian and tj. The author knows what they're doing and you can sense the darkness foreshadowing the author has given us about Jo and that once he comes to full term he might rival equally. Stop thinking it's green vs red, all these characters are imperfect and flawed.