AITBA for not inviting my parent’s friends to our wedding?

I(28M) and my Fiancee(27F) have been engaged for just over 11 months now.

Unfortunately due to financial constraints and a limited budget, we had to create a B list for our wedding guests. When we started giving out save-the-date cards, my parents wanted to include some of their close friends, whom we didn't know well, so they ended up on our B list. They were aware that they had been placed on our B list, and after we explained the reasons behind it, they were understanding and accepting of the situation. When we sent out formal invitations to our A list guests. All of our A list RSVPs were yes, leaving no room for our B list guests. My parent’s friends were furious when they found out and called me and my Fiancee out on it.

FYI: We truly wanted to invite everybody to our wedding and we wished we could have accommodated everyone.

Another FYI: Me and my Fiancee have payed them an apology and since one of our A guests changed their RSVP, we invited them to the wedding.