I'm not a YouTuber, but maybe I can think of some idea:
You need to have good PR skill. Because you will face negative comments, you need to know how to handle it/answer it with subtle language. You will also need to market your video and need some connections, so I think this skill is essential.
It will ask you to have a strong mentality to face critiques and haters.
This skill is essential not only for being a Youtuber but also for every professions, you know, especially the ones that require you to interact with other people. It doesn't come from audiences but your colleagues or boss as well. Thanks for the advice!