how do BP's react with kittens and such?

No. Just no. Once upon a time I thought my cat was outside so I took my ball python out and was holding her(I would never have het out with him nearby), however it turned out he was hiding in my blankets. I let her slither around a bit and he came out of the blankets and swiped at her like she was a toy. He skinned about a square inch of her fragile baby neck and narrowly missed the more important parts. It was a very close call and it took months to heal(it's a pretty ugly scar btw), and it needed cleaning and dressing about two times a day. She's fine now but she was pretty lucky.

I don't have cats, but I do have dogs, and they are usually in the same room whenever I have my snakes out, however they don't interact, and I don't let them "play" together..mostly for fear of what the dogs would do to my snake, not out of fear of anything the snake would do to the dogs...it's fine, just keep them a safe distance away, and don't expect they will "play" together...:D

I keep monitors as well as BPs and the other half recently got a kitten I do know some of my bigger lads would happily take the kitten so I always keep the door to the living room shut when cleaning feeding etc a) for both animals safety and b) the head ache I'd get from the other half if she found out my Nile at ether little ginger crazy kitten lol

I would say same room is fine but keep them a good distance apart and keep an eye on both of them. A ball could really injure a kitten, especially if the kitten is small. Even if it was a full grown cat, your cat could also injure your snake. I have both cats and a ball and they hang out in the same room together but only when I'm holding my snake, I'm just paranoid about something happening I guess. If I want to let my snake roam around the room for a little and explore, I put the cat downstairs. Problem solved :)