I think hate is too strong of a word. But I definitely think the combination of the Larry rumours and Harry having his own circle in LA had a negative impact on their friendship beyond band duties. I also think Louis felt a bit protective over Harry because he was the youngest. So when he started hanging out with LA crowd I think L was potentially a bit worried about him. But nothing is ever all sunshine and roses in these manufactured boy bands despite what the members say or howI don't want to believe that Harry and Louis hate each other that's so sad
They come across in interviews and other content.