I don't mind so much, unless it's a glaring error like the Rip you mentioned. Sometimes what is "supposed" to be capitalized seems randomly ambiguous to me. I often can't tell when to and when not to.
Also, different rules apply to different native languages, so when I see what I think are errors I keep in mind that English may not be the writer's native tongue. German, for example, requires all nouns to be capitalized. Some Germans are so in the habit of doing so, the habit follows in their typing of English. Asians that normally use symbols only for words, and not phonetic alphabets, might find English capitalization rules very confusing. Why wouldn't they? I grew up writing English and I'm STILL confused by it.
I use capitalization for emphasis on phpBB forums like this, only because I find it highly inconvenient to use italicizing or bolding. It's so much QUICKER and CONVENIENT to just use the shift key. It does annoy SOME other users though. I know because they've told me, but I don't let it bother me since there are also a lot of forums out there that DON'T have any other way to emphasize words. Capitalization works on ALL forums, so it's a habit I can use that works for all of them. No need to THINK about which type of forum I'm on. 
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...