That he's an edgelord who lacks empathy for others. Or that he's too op. I admit that he has some huge plot armor sometimes, but dude spent 13+ years training his mind, body and soul to extreme perfection. Knows like almost every martial arts, is one of the characters from DC with the highest IQ, has various degrees, etc. People will complain that he's not relatable like someone like Spider-Man, and that's okay, because he isn't supposed to be relatable, since he's rich to start with.