Remember that they are not typing in Portuguese, and in other languages places have other names/spellings.

I say this as a Brazilian myself, who is fond of the original spelling.

I live in Scandinavia, and do you feel it is fair for me to criticize you for writing Gotemburgo and not Göteborg, or Copenhague and not København?

The article is in English, the conversation is in English, and like it or not places like São Paulo are spelled without diacritics in English.

Or should an article in Portuguese in a Brazilian newspaper write Deutschland instead of Alemanha?