May not be irrational, possibly not a hatred, but an instant rage-cause.
People that advertise stuff they own and SPELL IT WRONG!
FFS, you have the thing in your posession, you've even photographed it WITH THE FUCKING LABEL and you still can't spell the name of the manufacturer/appliance. I've seen 'Pannasonuc' (Panasonic), 'Martyn' (Martin - on a guitar ad showing not only the headstock logo but also the inner label - both clearly showing MARTIN) and 'Ovartiun' (Ovation - another guitar ad) all in the last week!
It's simple to get it right, just copy out the label.
Drives me (even more ) insane.

Aaaaaand breathe
(Captain Placid 24/7 ball gags, brownie mix and clown porn, Mon 4 Apr 2011, 10:00, 8 replies)

is this referring to ebay?
The classified ads in my local rag were like that. Particularly about 12 wears ago. I don't think anybody who was selling an Amiga could spell it.
( sandettie light vessel automatic New Twitter - @bollocksreally, Mon 4 Apr 2011, 10:11, closed)

Ebay and the local glossy 'County' mag
I've just found (on Ebay) a 'Takemine' with a shot of the headstock (showing Takamine) and the label (also showing Takamine).
I fucking despair sometimes.
(Captain Placid 24/7 ball gags, brownie mix and clown porn, Mon 4 Apr 2011, 10:26, closed)

I love people like this.
As if you screw up the name, then people searching won't find it.
But if you add carefully thought through misspellings, and other parameters to your search, you may, meaning you get a bargain.
(speedevil, Mon 4 Apr 2011, 11:19, closed)

^
I've picked up some great Transfomrers, Trasnformers, Transformrs and so on
( emvee cruor deo cruoris, Mon 4 Apr 2011, 13:52, closed)

It's everywhere
I read the local paper's sports articles online and the stories often allow comments. People will be commenting on an article that mentions a player's name 73 times and their comment will spell it wrong - occasionally they'll spell it wrong IN DIFFERENT WAYS IN THE SAME COMMENT. Argh.
( The Light in Chains don't touch the Pope's boner, Mon 4 Apr 2011, 12:00, closed)

It doesn't matter, apparently.
Apparently it makes no difference if your spelling is correct any more "languages evolve" and you're just a pedant if you expect people to be able to read.
Welcome to the world of idiots.
(Me, I'm not... in any way intoxicated, Mon 4 Apr 2011, 18:56, closed)

Well..
The answer to those particular wastes of DNA is 'So it's fucking evolved to be something different from what's actually printed/stamped/etched on the item? NO IT FUCKING HASN'T YOU LAZY HEAP OF SHIT - GO AND WRITE IT OUT A THOUSAND TIMES CORRECTLY-and then kill yourself'

Perhaps an overreaction?
(Captain Placid 24/7 ball gags, brownie mix and clown porn, Mon 4 Apr 2011, 22:37, closed)

I'm always wary
of ads with incorrect spelling. I imagine that if I buy a under-priced Takamine online and a hugely over-priced piece of Chinese shit with Tekeminge on the headstock turns up on the doorstep, I've got no comeback. The ad didn't say it was a Takamine, only my greed for a bargain and the assumption that the picture was correct and the spelling wrong, not the other way round.

What does piss me off is ads in the paper for a "6 birth caravan".

Erm, not that I'm looking for a caravan, honest!
(Rsoles, Mon 4 Apr 2011, 20:37, closed)