Wow, that is not a way to get people to adopt! I am sorry you had that experience. Too bad you aren't closer to the bay area, you could come to ARF (www.arf.net) to get a new kitty.
There are some volunteers at ARF that can be a little like the OB you dealt with. But if any staff member ever heard it, it would not fly.

It just wasn't meant for you to adopt from that place at that time (if you do plan on going back again). You will find the perfect sister for Jack in due time.