Assuming everyone is from America/UK, and that English is their main language, is kind of a douchebag thing to do, especially on an international forum for an international currency.
I'm not assuming he is from any particular region. Why do you assume that I'm assuming that or that I'm even from America/UK myself?
Because you obviously assumed that English and subsequent grammar was
their first language. Also, this ethnocentric douchebaggery is a rather stereotypical American thing (the "Speak English!" crowd)