I don't mind things being written in non-American English because i feel like I'm getting some cultural introspective looks. Even if I don't know what a particular word or phrase means, I can just look it up or use context clues. Then if you use American English then you'd have to use certain words and phrases that might not even be ubiquitous to us all so either way you'd leave some readers scratching their heads. And colloquialisms here are abundant so which "standard" would you even use.
And being in the U.S. (send help) and knowing how people here are, it might be a matter of them being too lazy to figure out what's tripping them up rather than it being too jarring for them so I wouldn't pay it that much mind