我英國朋友跟我說: "I think 'Mongolian' has negative connotations in this country."
"The use of the word 'Mongol' is doubly offensive, to Mongolians and to
people with a disability. But as I said, I haven't heard it used for a
long time. I don't know whether kids would still use it at school.
Similarly, kids at school would call someone a 'spastic' if they
thought they were stupid, or sometimes abbreviated to a 'spaz'. The
word spastic means someone with condition such as cerebral palsy, but
it came to be used as an insult, so the word is not used now. There
was a charity called the Spastic Society for people with the
condition, but they changed their name some years ago to Scope due to
its common usage, as Wikipedia puts it, as a 'playground insult'. Even
when I was a child, I would never call someone a Mongol or a spastic."