Absolutely agree. We can "read" them and we can tell when they are grumpier or not, but we can NEVER be 100% sure of what will happen.
That is why I would never, ever allow my snakes and other pets to "interact". Not even if neither shows much interest. Because it only takes once...and can leave the snake or other pet hurt and traumatized. There is just no good reason to risk this.
Heck, we can't even always predict what other humans or even our friends will do, LOL. Much less a exotic animal..