I think the thing to remember is that just as no one has any right to tell you what kind of wedding you may have, you really cannot dictate how people may react, or tell them how to feel. Hurt feelings are valid feelings, you can't help them, it really doesn't matter how many times someone says 'I'm going to do this', if it is something that you think is hurtful, then you will be hurt.
There is also some ground between a massive fuss with bridesmaids, hats and God knows what, and telling no one except two friends and announcing the whole thing as a fait accompli in front of other people. In my opinion, that is a very thoughtless way to behave, and smacks of being completely oblivious to anyone else's feelings.
You could have had your wedding exactly as you wanted, then you could have gone round to your mum and sister, and your DH's sisters and told them what had happened and that you hoped they'd celebrate with you at your party. They'd have had time to adjust to your news.
It's easy to put a brave face on rejection (which is effectively what excluding them was) if you don't care about the people doing the rejecting or you don't know them very well and have a strong sense of being on your best behaviour however much you may be hurt.
They weren't important enough to even be told in a slightly more personal manner.
And now you're pushing them away again, when they are trying to offer the olive branch. They are showing they are prepared to move on, you aren't.
So are they important enough to want to continue to have a relationship with, or is the most important thing here that they have to be publicly embarrassed again, by having to grovel to you?
Don't get so tied up in being seen to be in the right, that you forget what really matters.