It's kind of a mix of ableism and I suppose the fact that in school people correct each other's grammar and so it seems sort of the done thing? I mean it's learned behaviour from adults that correct us while we're growing up. The strange thing is that it's hard for dyslexic people to always write clearly, but it's also hard to read when others don't do it. Just can't win!
i'm a fan of the stylised grammar that the internet often uses tho, because i spend too much time on tumblr i suppose, and a lot of the humor there seems to rely on run-on sentences and pur poseful typoes to indicate EMOTiON and ExitTEMENT... and ending a text message with a full stop means you're angry so i never do that either haha
and yet e.e. cummings - maddening. I struggled for a long time with Cormac McCarthy not using punctuation for dialogue, and doing stuff like capitalising some things (like American, Mexican) but not others (english, or spanish) too
Also if i see a typo or a misplaced comma on something in print, like a sign or a leaflet - especially if it comes from a university or a political party - it does annoy me because it means someone hasn't proofread, and i think that's bad design. unprofessional lol
the thing that irritates me the most is things like 'from the 1960's' or 'throughout the 1870's'... no, no apostrophe... it's a plural (a group of years) not something that belongs to the years... this is because i had a history teacher that was enraged by this too, and she must have had a big impact on me P:
Language does evolve though - 300 years ago every noun was capitalised. Nowadays that just looks really strange