However, I have little regard whatsoever for people who show little to no restraint in being harsh/rude, far beyond what is necessary to convey a message.
Paraphrased from Bright: "If you're tactful, your point may get through. If you're blunt, it's sure to get through." Nobody should have to show restraint in being harsh/rude if the harshness gets the message through well. Nobody is required to give you any help at all, so "beggars can't be choosers" applies here. If someone's straight-up calling you an idiot, obviously, tell a Staff member, but don't look down on people who are only trying to help you.
Also, if I had my way, I would make it illegal for anybody to use the term "Mary-Sue" as an accusation without having first read "The Girl Who Lived" book 1. Rose Potter is by far the biggest offender in human history, and I think it's handy to have a common point of reference.
Nobody cares about Mary Sues that were written in other literature. You can identify [literary mistake] perfectly fine without reading [work that exemplifies literary mistake].
In addition, the fact that you challenged our ability to make criticisms instead of addressing the problems we pointed out is deeply worrying, and if you can't figure out why, then I can't help you.
As an aside, I have neither the time nor inclination to read your entire draft, but to make bulleted lists, you need a space after the asterisk.