Rule 1 of the reputation system is that you don't complain about having a low reputation

Rule 2 of the reputation system is that you shouldn't care about your reputation too much

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No, you don't know it is Ninja, because reputation ratings are anonymous, and there's multiple people "loathing" you (thanks to the behaviour that got you banned before), and you can't know whether Ninja is the only one visiting 'Miscellaneous Art' that often.

Anyway, since you've been unbanned, you've received a grand total of 4 ratings, of which two were positive, and your net reputation went up rather than down. So I don't really understand what you're complaining about. I can see the reason behind the downvotes, as well (no, I'm not going to explain them to you). The "y u unpleasant" rating made no sense though, so I've deleted it.

(Side note: you've now received an additional negative rating, from me, for posting such an unfounded complaint in the wrong forum. Woops!)