As others have already mentioned, comparing a choice of a common language for communication to discrimination issues is just completely baseless.
In total, picking a common language and sticking it makes it much easier for people to communicate. Sure, the native Spanish speaker will have more trouble with English than with Spanish, but what about the next guy, that happens to speak French and English and wants to read the Spanish guys comments?
Suddenly people don't have to learn English as a second language, but have to in fact learn all the languages that other people on the project like to use. Of course everybody will still have to learn English, but now you better also know some Mandarin, French, Spanish, or whatever somebody else felt like using. Latin anyone?
In total, picking a common language and sticking it makes it much easier for people to communicate. Sure, the native Spanish speaker will have more trouble with English than with Spanish, but what about the next guy, that happens to speak French and English and wants to read the Spanish guys comments?
Suddenly people don't have to learn English as a second language, but have to in fact learn all the languages that other people on the project like to use. Of course everybody will still have to learn English, but now you better also know some Mandarin, French, Spanish, or whatever somebody else felt like using. Latin anyone?