As for annoyances "try and" grates on my nerves, because it's so often used by authors who should know better. Using "which" for "that" is also too common, and variants of "her and I" set my teeth on edge.
I
have learned not only to let go of fragments, but to appreciate them, in many cases.
I'm wary of posting about poor usage and grammar, because I so often see careless errors in my own posts after I've posted them.
I'm
forever (
) catching dangling participles, missing commas, and other errors that arise from editing only part of a sentence.
I also use 'net slang enough to lose my seat in the Proper English Purists Camp.
So, while it is important to me that a writer be fastidious, I don't get too uptight about all the errors people commit in their hacking out a post on a conversational forum, unless they're egregious. e.g., "should of."