It reminds me of the people in school with that "I worked really hard on this so nobody tell me it's anything less than perfect or I'll cry" attitude. Downvotes are part of the feedback for content creators.
Youtubers probably do cry when they get downvotes starting out. You know what they do with that information? They adjust their content. Downvotes aren't just for the reward pool or the downvoter; they're important feedback for the content creator
That being said, yes, the easiest thing is probably to stick with objective flag reasons. It will help keep the peace, even if I think it's silly