PeePantz said:
Grammar/spelling that poor almosts nullifies a post. It shows that the OP didn't take much thought in the thread and didn't feel the need to correct his mistakes, thus making the importance of his/her post lessen severely. Poor spelling can easily be corrected by simply checking after those red dots mark a misfire. Not only does this help correct the ignorance of the OP and help him state a stronger case, it helps everyone stay clear of bleeding eyes.
And the exaggeration you express there shows exactly why your point lacks validity.
The most important part of a person's opinion should be exactly that, their opinion. Not the way it's presented, not any errors or spelling mistakes and definately not because you appear to have an irrational fear of poor grammar.
Not everyone is good at spelling (and not every browser has a spell-check in it, mine doesn't and while my spelling and puncuation is usually very good I do make the odd mistake here or there that gets by me and it does stick out to me when I read my post again after I submit it) and quite a few people have legitimate reasons for this such as Dyslexia, English not being their first language or even just not having done so well at school.
My mother, for example, frequently has to ask me to help her spell a lot but she did have a lot of difficulties with school and in childhood, this isn't nessercarily her fault and hurling abuse at her or making light of how atrocious it can be sometimes isn't going to help her writing improve in quality (in fact, it probably does more harm than good).
Very rarely is it laziness that causes people's spelling and grammar to suffer, you can tell when it's laziness, they wouldn't bother writing much to begin with and my whole 'disagree with what's said rather than how it's said' thing would probably apply then.
So stop yourself the next time you're about to rip someone a new arsehole for improper use of inverted commas and think about what difficulties they may face that makes typing challanging for them, then try to grow up and just address their damn point rather than being a petulant child and throwing a tantrum over how neat someone's proverbial handwriting is.