[In this scene Rohan approaches an extremely weary Koichi, Rohan plays it extremely casual and plays into Koichi's timid nature]
Now, now, you don’t have to be so defensive. My days of causing you harm are long past. Besides, after reading your history with heaven’s door, I found myself filled with a deep sense of respect for you. I’d go so far as to say we’re two peas in a pod. Wouldn’t you agree? Now then, I’d like to ask you a question if I may. You see, I used to call this area around here my home until I was four or so. I’ve spent the day trying to find my old residence. Nostalgia must have gotten the better of me. Recalling one’s childhood is central to a manga artist’s work. However, those memories belong to a four-year-old, so they’re a little bit foggy.

[Unfortunately, I was only able to find the scene in Japanese]
https://www.youtube.com/watch?v=Wj75kDtYMPQ 

[In this scene Josuke is charging towards Rohan, and Rohan reads to find Josuke's weakness is hair insults]
It seems certain comments set you off such as your hair is laughable, or wasn't that pincushion in fashion like two decades ago? Or maybe you think that hair looks cool don't you?

Here goes. You might think your hair looks cool, but in actuality,it may be the shittiest hairstyle I have the misfortune of laying eyes upon. Though to be fair, that nest upon your useless noggin may come in handy should a Pidgeon come by and decide to roost. But that's a very strong may.

Now Witness Heavens Door!

I win.

https://youtu.be/o9TZQ7mN0Vk?t=65

[In this scene, Josuke goes back to the tunnel to heal Rohan after the stand user is defeated, He acts very stuck up and snobby at the fact someone like Josuke would save his life]
Why the hell did you heal me? You’re such a moron. I would have preferred wasting away than have the likes of you save my life. I told you to run away, but, as always, you had to step right into the enemy’s trap. How do you function? By the way, you and I are even now.

https://youtu.be/yZ6u0NwwoRY?t=243