It's considerate to show gratitude when others help you.
Omar was riding his bike in the park when he hit a pothole and flipped off the bike, and now Ken is helping him get up.
Omar wants to say something to Ken.
Omar tells Ken that he is very thankful someone was there to help him after his accident.
Omar tells Ken that he didn't need to help him up, that Omar is a man, and he can handle his own problems.
Ken is happy to hear that Omar is grateful and is warmed to help someone out who deserves it.
Ken thinks Omar is bizarre in his hyper masculinity and is annoyed that Omar is brushing his help off.