Favorite is spelled wrong, you spelled it "favourite", which is wrong (even spell check says it's wrong).

I'm not sure if this is a joke or not, but nevertheless I'd like to apologize on behalf of Americans everywhere.

You have some misspelled words in your post. I believe it should actually say "I'm an idiot."

http://en.wiktionary.org/wiki/favourite
"Favourite" is the correct way to spell it.
The american simplification "favorite" is however also an accepted way to spell it.
It is common within american-english writing to ditch the "u" in words like "favourite" "colour" and "harbour".

I learnt something today. Thank you sir!

By the...

You forgot this one:

Favorite is spelled wrong, you spelled it "favourite", which is wrong (even spell check says it's wrong).
On a related note, not many people manage to spell their usernames wrong. Seriously, how did you manage to spell LameTroll as Ezri?

It's OK, I have taken my share of crap about things like this. For the record, I believe that British English should be used everywhere but North America, even if you are American.

Someone could create another demotivation poster with picture from Naked Gun 33⅓: The Final Insult, the final scene at the Oscar awards ceremony where the whole audience /facepalms. That would be fitting here.

It would appear you meant well, but your research was lacking. Don't feel too bad, I've done similar things before. Live and learn!

yeah don't you hate it when the shit hits the fan.

Yeah, I would not call troll on this so easilly: color-colour, meter-metre, jail-gaol and more.
There some other changes (though mostly slang or pronunciation) if you go to other English speaking countries as well.

Yeah, I would not call troll on this so easilly: color-colour, meter-metre, jail-gaol and more.
His past posting history is playing a huge factor here. Given previous posts, such an "honest" mistake seems less likely.
Now if we really want to mention a possible mistake, technically, the wording "This is my favourite forum" is incorrect as we can mark more than one forum as a favourite.