While I do concede that LordBucket's teaching methods are, uh... blunt, to put it diplomatically, he has made a few really important points.
If you want to be a good writer, everything you write - whether on a forum, in a book, scrawled on bathroom stalls - should be grammatically correct. Not because it's vital to your audience that you use the correct their/there/they're and that all your punctuation is in the correct place, but rather because you will end up writing books the exact same way you write forum posts. You get good at what you practice.
Ok, I know I am bad at writing, I admit that. I am bad at speaking, I admit that. But the forums to me is somewhere to converse with likeminded people and not have to worry about them judging you, If I spent all the time checking my grammar and making sure that I didn't sound like an idiot then the forums would get really boring for me. Sure, in writing a story you should be grammatically correct and all but in real life, I sound dumb, really really really dumb. So I feel like I should sound really really dumb here or it would just feel to fake and take the fun out of it. Checking my spelling is fine but my grammar sucks, I sound bad, I look bad, I am bad, so I freely let that go on the forums because I don't think that a lot of people are going to immediately criticize my grammar.
Oh and by the way, thanks for the challenge, I'll try.
You know, it's funny. You'll only sound dumb if you try to speak aloud with proper grammar, but writing is a whole 'nother can of worms. Trust me on this: it's a whole lot easier to sound dumb in writing than it is to sound fake. Nobody is going to lambaste you for your attention to detail if you use proper punctuation, but a little part of me dies inside whenever I read a sentence with a misplaced comma or missing apostrophe.
Also, if writing with proper grammar sucks the fun out of it, you need to practice until it becomes natural. If you're unwilling to practice, you shouldn't be a writer. The good news is that practice opportunities are everywhere. (Pro-tip: I'm referring to this very forum. Practice here. Git gud.)
Ok, I didn't even skim this, but I saw this sentence:
"1) "Crap" is a social class indicator. Generally best avoided unless you're deliberately using it to provide characterization."
What? Are you saying that by using the word "Crap" someone will somehow give away their social standing within their society? Or that "crap" is used as a word to denote a particular social class? Because neither seems very accurate to me.
Pretty sure LordBucket is just referring to using crap as a descriptor in the narration. If you read the sentence 'the car was a piece of crap' in The Dresden Files, it'd be fine: the books are told very casually from a first-person perspective. It's characterizing the narrator as someone who would use the word 'crap' in a sentence, while the word should otherwise be avoided entirely because of how colloquial it is.
If you opened up Game of Thrones and read 'the carriage was a piece of crap', you'd think to yourself that George R.R. Martin is a hack. When said by an omnipotent third-person narrator, it would be considered poor form.
As a more personal example, I've said 'whole 'nother can of worms', 'git gud', and used ellipsis to indicate a silent beat in a sentence in this very post. All three of those are acceptable in context because of the medium (posting on a forum) and give you an image of who the narrator is, but they still obey grammatical rules (using an apostrophe to indicate omitted letters, for example).
You used nearly as many words to convey a single piece of advice as he used to write the introductory post, which has at five separate ideas that I can pick out. And that piece of advice was to not be redundant/repetitive...
Different goals, different rules. LordPyrrole was explaining his situation, LordBucket was proofreading. The redundancy was because he was making a list, rather than summing up the end result.
tl;dr: Practice writing with proper grammar from here on out. Every time I see a post of yours, it needs to obey the rules of grammar or I will be very sad. My feelings will be hurt. This is a bad thing.
Also, listen to the other people in the thread. They're giving good advice.
On a tangentially related note, I have a sneaking suspicion that LordBucket is secretly Kazerad. He runs elaborate forum games, has connections with both MLP and TES, and types out gigantic essays on writing. There is no other possible explanation.