Definitely don't ask for it in Spanish!
https://lemmy.world/post/23070825

Definitely don't ask for it in Spanish! - Lemmy.World
Lemmy
Wait, what would the problem be with asking for a café solo?
¿Cómo se dice “black” en español?
Not next to the word coffee, is how.
Look, there's half a billion of us and I'm not gonna reject the possibility that wherever you're from people say "café negro" for some reason, but yeah, no, it's "café solo" as fas as I'm concerned. You might as well call café con leche "café beige".
My first time in Spain I asked for café negro and was corrected to say con leche. Not in a ‘that’s racist’ kind of way, but in a ‘that is inaccurate, even though we understand’ way.
“Café negro” (which I’ve never heard for black coffee) would be “Café solo” or “Café sin leche” (literally, “coffee by itself”, or “coffee without milk”). “Café con leche” would be coffee with milk, which definitely is not black coffee.