Ok...this doesn't make sense and we've had this very discussion before.
If you're making fanart for someone, as a nice gesture, and they don't like it -- they just don't like it.
Unless you were making some really questionable fanart of their characters or of the creator themselves (and I'm talking some weird, creepy stuff that would upset MOST people) why would they be hurt by you making fanart?
Them not liking your style is a preference -- it's subjective, it's based on taste. That really doesn't mean you've hurt them.
They just don't like your art-- and it happens to ALL of us at some point.
However, if you have been arrogant in the past (believing you're better than everyone else, shutting others down, or something of that nature), then it's good that you've realized your behavior and tried to change it
What's not good is how you're going about it. Darling? Kiddo?
Being self-deprecating is not a better improvement from being an arrogant jerk.
If arrogance is on one extreme end, self-deprecation is on the OTHER extreme end.
And neither one will convince you to build confidence in your work.
Like @punkarsenic said -- find a balance. You don't have to constantly murder your art in order to be humble. That is literally the opposite of being humble. If anything, that's arrogant in and of itself because you're so sure you're "the worst of the worst"