I would never ignore you!
I can fully sympathise with the frustrations of communications breaking down between two people speaking the same language. Saying something like "speak English" to anyone from an English speaking country is just ignorant.
I really enjoy learning the differences between the two and it's been one of the most enriching parts of being on a TP forum. I've definitely gotten so much more out of the DW books being on this and another TP forum! You really have to think of them as two different dialects - getting frustrated isn't very productive in that case.
My youngest was recently facsinated to find out that cookies are called biscuits over there. She said, "Well, what do they call biscuits then?"
Which, after some discussion on the other forum, I've come to realize that there isn't an equivalent over there to what we call biscuits here. All of which I think is great fun!