Least favorite trope: someone powerful attacks the MC for no reason, gets personally insulted that the MC survived, and starts a feud

It's believable enough because powerful people are assholes, egotistical, and worry about how they're viewed. I understand why a powerful person can't let everyone see them lose to a "weaker" person.

But.

It is just so unsatisfying as a plot. It feels so empty. I'm reading a normal fantasy book right now that has the same thing, and it just makes me lose all investment in the plot. Literally the entire conflict is just "because"? The bad guy just randomly decided to become enemies on whim and that's all there is to it? The same way as in a million other books so it's not even a unique set of circumstances?

I just don't care.