Woo-hoooo!! WELL DONE! Way to go, Girlfriend!!!!!!!!
I guess great minds think alike, right? 
That had to be infuriating and deflating at the same time. I don't know whether there will be any other opportunities to pass these thoughts along to them, or even if you would feel up to it. But I think it is something that would be valuable to stress to them again, if you can - either orally or if there is any sort of written group self-evaluation or anything similar. Some people (like the group) need to hear something multiple times before they "get it."
They need to understand that it is important - when working in groups (I guess I should say in this type of group) - to be sure everyone understands what they are supposed to do and, if possible, why; and it can also be helpful to have at least a general idea of what the others in the group are doing. I'm pretty mad at those people right now.
Well, yeah! That's putting it mildly, I would have to say.
You certainly deserve to give yourself some pats on the back for all the good things you did throughout the project and presentation. You jumped some pretty big hurdles, didn't you? and quite beautifully, too.
I don't know those people and I don't know how valuable their opinion is to you. But just remember that some people in the world will find a way to find fault with others, no matter what the truth is. I got a big boost one time when someone pointed out to me (after someone had said something cutting to me): "Consider the source." If the group acted or spoke brutally or unkindly towards you, that says more about them than it does about you.