Your arrogance is astounding. This is why people hate Americans.
An English person, writing English in an English way, and you say you're not going to continue reading. Do you require him to write like an American? Why should an English person, writing their own language, have to follow your conventions?
"I didn't know"
Well then don't start shouting your mouth off! If you don't know, keep quiet.
I had a hard time reading that phrase, and I thought it was because he didn't spend enough time editing the article. I like to think I am a cultured person, but I truly didn't know it was grammatically correct in British English. Don't judge all Americans just because I am naive.
Your misunderstanding and dramatic response is astounding. It's ignorance, not arrogance. Say what you want about his reaction to the perceived poor grammar but it's nothing more than that.
For the same reason you didn't bother to figure out whether it was ignorance or malice on his part before jumping to your own convenient conclusion, I would imagine.
An English person, writing English in an English way, and you say you're not going to continue reading. Do you require him to write like an American? Why should an English person, writing their own language, have to follow your conventions?
"I didn't know"
Well then don't start shouting your mouth off! If you don't know, keep quiet.