Making "negative comments" about someone and hurting their feelings may get your channel shut down on YouTube.
From YouTube's new "Harassment and cyberbullying" policy:
We want you to use YouTube without fear of being subjected to malicious harassment. In cases where harassment crosses the line into a malicious attack it can be reported and will be removed. In other cases, users may be mildly annoying or petty and should simply be ignored.
Harassment may include:
Abusive videos, comments, messages
Revealing someones personal information
Maliciously recording someone without their consent
Deliberately posting content in order to humiliate someone
Making hurtful and negative comments/videos about another person
Unwanted sexualization, which encompasses sexual harassment or sexual bullying in any form
Incitement to harass other users or creators
Here's YouTuber Philip DeFranco talking about the changes:
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