If a debate is written in English, should replies be in English too?

More and more opinions on English debates arrive in Hinglish, like "Bhai, tera naam kya hai?" Some say replying in the language of the debate is basic courtesy: it keeps the discussion clear for everyone, including people who don't read Hindi. Others say Hinglish is simply how India talks online, and forcing English shuts people out. Should replies follow the language of the debate, or should people write however they're comfortable?