I'm pissed about how my wife whistles to get my children's attention in public.  She uses the exact tone that you would use to call a dog.
Does this only happen in public?
When we're going to the department store she whistles as if it was a call for a dog.
It's wrong for your wife to treat anyone, including kids, in such a disrespectful manner.  You should be respectful of her, though, and talk about this calmly, without getting angry at her.  Try to find a way to agree on how to raise your kids together, so you can present a unified front.
That is the most mature thing I have heard in a long time. You are 1000% correct! I will do this and then maybe things can change.
Talking is one of the most useful forms of communication, literally. I'm not sure why more people need encouragement to do it. I just think it makes sense.