i had somewhat of a struggle in the beginning with the terms 'sub' and 'subbie', it made feel like i was being referred to as 'sub human', but educating myself and ALOT of reading (lol) i soon got past it.
Now, i really have no problem with any term, not even the term 'slave' (maybe because my Mistress uses it to refer to me as her 'sex slave).
i know i'm submissive by nature, so whatever term is used(sub,submissive,slave etc.) and whatever connotation it comes with, doesn't really much matter to me. i don't pay much attention to the labels anymore because i know what i am, i know my role and purpose in my relationship with my Mistress.
We know what's in each other's hearts & souls, i give my submission as a gift and She receives it as such.