Why don't people spell or use grammar properly?

Excluding people with dyslexia, of course. And excluding genuine typing mistakes.

So many people misspell (and use in wrong context) your/you're, there/their/they're, to/too/two, and the stupidest one- then/than.
When you get to a certain age, how can you not know the differences between these spellings?

And when people point it out, they get abused like "Omg you're such a loser!! I don't care if I'm spelling it the wrong way, **** off."

I'm not talking about when people use slang like: "Ppl tlk lyk dis an dat enit, u knw wht I mean, yh? Or dey jus use da occasional abbreviation lyk 'ur'."
I mean like proper sentences where all the words are spelt correctly, but if you just use 'your' when it should be 'you're' or vice versa... Why?? They get so annoyed and call people who do spell correctly losers/sad for caring, but the differences in the English language are there for a reason, right?

I don't point mistakes out (unless it's in someone's essay and I want to help them) but it does really annoy me to see those mistakes. Does anyone else find it annoying, or do you think I'm a loser too?

Was just thinking about it because I see all these Facebook groups/pages with spelling errors in the titles...

This especially annoys the HELL out of me!!!
So true OP, but you know you're going to get flamed for this lol!

Excluding people with dyslexia, of course. And excluding genuine typing mistakes.

So many people misspell (and use in wrong context) your/you're, there/their/they're, to/too/two, and the stupidest one- then/than.
When you get to a certain age, how can you not know the differences between these spellings?

And when people point it out, they get abused like "Omg you're such a loser!! I don't care if I'm spelling it the wrong way, **** off."

I'm not talking about when people use slang like: "Ppl tlk lyk dis an dat enit, u knw wht I mean, yh? Or dey jus use da occasional abbreviation lyk 'ur'."
I mean like proper sentences where all the words are spelt correctly, but if you just use 'your' when it should be 'you're' or vice versa... Why?? They get so annoyed and call people who do spell correctly losers/sad for caring, but the differences in the English language are there for a reason, right?

I don't point mistakes out (unless it's in someone's essay and I want to help them) but it does really annoy me to see those mistakes. Does anyone else find it annoying, or do you think I'm a loser too?

Was just thinking about it because I see all these Facebook groups/pages with spelling errors in the titles...

Says the person who used two question marks on one sentence in the thread title.

Why is it important? The word "gay" never used to mean homosexual, now it does. Language changes.

Some people like to preserve language.

(I) Was just thinking about it because I see all these Facebook groups/pages with spelling errors in the titles...