I guess that both of them have personal interests that didn't benefit him and the other and so, the conflict goes.
It's about the interest. When rich people quarrels, it's about who the interest is favoring than the other. All we do, is to watch how they take on themselves negatively on the deals they had.
This beef between Trump and Elon is not stopping anytime soon because both individuals have pride in them not to plead or succumb to the other person negative advances. Elon Musk will actually lose in this case because there is no way you will win a sitting president of US in their soil as a visitor without losing their significantly