I appreciate the expression of feeling here! I know it sucks to get upbraided by moderators (and we don't enjoy it either). But it's definitely not personal. The moderation response would have been the same regardless of user, since we're not focused on usernames to begin with.
What attracts our attention are, in this order: (1) a post that breaks the site guidelines; (2) the other comments by that account; (3) whether we've posted moderation replies to that account before. It's true that that the username is what links (1), (2), and (3), but what we're paying attention to is mostly the content.
I think one factor here may be the tendency, which we all have, to underestimate the provocation in your own statements and overestimate it in others [1]. Those two distortions compound into quite a skew [2], and makes it easy to feel like one is being singled out or treated unfairly [3].
Beyond that, when you run across other posts breaking the site guidelines and going unmoderated, it's easy to jump to the conclusion that the moderators are biased or secretly agreeing with those other posts. But this is a mistake. Overwhelmingly the reason for this is simply that we didn't see those other posts. We can't moderate what we don't see, and we don't come close to seeing everything on HN (or even 10% of it) - there is way too much. [4]
[1] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
[2] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
[3] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
[4] https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...