1. By this logic, we should abandon most words in the English language, because non-native speakers might otherwise need to learn them. Somehow though, you've applied this logic only to the word "blacklist". And why should a language with its own literature and history abandon its own vocabulary?
2. The usual reason given for not saying "blacklist" is because of supposed racism. Your argument is a new one, and seems to have been produced post-facto. Your comment is sophistry.
Not really. English remains the most spoken language in our circles and it's immensely helpful because of that. What we can all do is to look for better names. Master/slave can be replaced by primary/replica, publisher/subscriber and a lot of others that offer narrower meanings and, therefore, are better names.
2. The usual reason given for not saying "blacklist" is because of supposed racism. Your argument is a new one, and seems to have been produced post-facto. Your comment is sophistry.
[edit] Removed some scathing remarks.