[syhprum (OP)]

Used by a portugesse speaker about Sir Lewis Halminton

[Bored chemist]

Because it's no longer 1960.

[Petrochemicals]

I believe the cultural aspects between Mexico and the UK are stark when considering race, they have a very long history of ethnic diversity and the intent of the phrase quoted is very different.

[Origin]

Because it was a derogatory name for slaves in the USA.  I find the term extremely offensive and recalls the shame of the early history of my country.

[evan_au]

Politically correct terms change over time.
- Even terms that are introduced as being more politically correct are later canceled.

negro (Spanish) ≡ black (English)

I understand that at one time, "negro" was unacceptable in the USA, but "black" was acceptable.
- I'm not sure what is acceptable in the USA today.

The current trend in Australia is to use "First Nations".