Man, I had a lot of questions like yours! Being a brazilian myself and loving dance (including the ballroom dances), those questions are sure to come up!
What I settled with is that these are fact, we just got to accept it:
- Ballroom dancers are in majority very stuck up. They have very defined rules for their dances and like to put everything in the same rules set. They tend to disdain any partner dance that does not have similar posture and rules set. (I'm also a ballroom dancer, it's just a steotype, not an attack)
-Every ballroom dance has been inspired in some folk dance. Since the Latin ones are based on cultural dances that still exist and are maybe more known than the ballroom version, they tend to be the most confusing. Ballroom dancers should know that, since even inside ballroom dances there are international versions of a lot of dances that carry the same name and are completly different. But because there are very few of them that knows about the real samba, they are ignorant to the fact that what they do is not samba.
-Samba was born in Brazil. It is a brazilian treasure if you will. If there is a right way to dance it, it's your way, learned in Brazil (although I have rarely seen a non-brazilian do it right, no offense).
-What they do in ballroom is an outrage to be called samba to any brazilian who sees it. But the fact is, there is no patents on popular names, and they can call it whatever they want, and will continue to call it samba! If you talk to ballroom dancers, that's what samba means. If you talk to brazilians, Samba means samba. In the doubt, I call it ballroom samba and brazilian samba.
I bet the same thing applies to cuban ramba! That's just the way it is.
By the way, Ballroom dance is not even danced to Samba. Samba is actually a rythm that has a very specific and dificult timing, and ususally very fast. Most sambas are too fast for the ballroom dance so it is danced to other rythms and music that I'm not sure how to qualify them. But rarely is it even going to be brazilian music.