Funny enough, I've shown him examples where Morgans' beak is not consistently drawn the same way. Sometimes it's more rounded. Sometimes it's more straight. Sometimes it's more sharp. When shown front you can't even tell it's bent.
Like look at these images for King:
You can clearly see that in King's intro for his fruit, the beak is clearly not perfectly straight off the bat. It curves down, just less exaggerated than Morgans' because it's longer. This is also the ONLY clear instance of King's appearance in beast form before Sanji and him clash. This is the ONLY example people can pull from. We can't see how other angles look. We can't see how Oda would have drawn it in other ways, because he never does until after they clash.
Then you have this one, in his reintroduction after they clash:
Look at precisely at how the Oda drew King here. Kings face is more in the foreground here than the background. You are seeing his face more up close, and the beak is drawn in a way to show that there has always been a curvature to his beak. If the argument is that the beak is bent, you'd see clear damage to it or a "rinkle" on his beak, indicating its actually bent out of shape. Think when Luffy punches Caesar in the face so hard it literally bends his face in 3 directions:
Comparing to that, the beak looks perfectly fine in that regard. No blood, no bruising, no actual impactful damage. It's never even mentioned that he WAS hurt, unlike Sanji who got panels of him hurt on the ground.
So it's not that his beak was bent, it's that his beak was always bent to begin with. Not on the level of Morgans, but literally just based on how it's drawn initially. There are examples where his beak goes back to looking more straight too like the first image:
Tldr: It's a stylized choice by Oda when to curve King's beak, which is namely dependent in the way King's face is drawn (angle, open mouth, closed mouth). The single "angle" argument that people were using before to say that his beak (in the 4rd image) is only straight due to the angle is actually an argument against them, because we've only seen one image of King's beast form before he and Sanji clash and it is also straight with the same exact angle. Its also NOT consistent at all even when drawn from the same angles.