The short answer is of course it is.
But we are all racist / sexist / heightist / many other-ists depending upon the life experiences that we've had.
I know the group you mean - and it is my experience too that many AMs / programs from there have very "sharp" business practices and frequently go back on agreements without any apparent concern for their word of honour. Cash rules - honesty suffers.
It doesn't stop there ...
I've automatically banned emails from .cn, .ru, .in and .ng too. GASP! Clearly racist !
I've also banned all emails from hotmail too! GASP! Clearly hotmail-ist!
It really does not matter what a 3rd world
SEO expert with a gmail account puts in their email to me - as I will delete it without reading it ... and I no longer believe anything that ANY Nigerian businessman / prince says to me without double verification ...
I know it's stereotyping and "all-sorts-of-ist" - but I think may internet workers do have procedures based on previous experience.