Exclusion is a better word for what is going on than hostility. The name is based on the homonym between 'man' as short for 'manual' and 'man' as a synonym for 'male'.

Though a tool for manuals the author chose the namesake by the identification with males.

Do you see why this might make some people feel excluded, why if you want to make a tool to help people it's probably a good idea to not exclude people?

Are you saying the name is a good name? Or just defending the right to be exclusionary?