I can’t believe I have to say this, but it seems somebody does.
Negia is an issue of a man and woman who are not closely related (e.g. mother & son; husband & wife) not being allowed to exchange physical touch.
This has no connection whatsoever with the following:
It is assur to violently assault another person, even if you are a man and so is he, or even if you’re a man and the other person is a lady that you are married to.
Kicking another human being, or a dog or a cat, is assur.
In case you’re still confused:
No, you can’t do that even if he (male neighbor) dented your car, or she (wife) insulted you, or it (cat) made a mess in your flowerbeds.
(I would add that being a “little kid” is no excuse, and this is one of the first areas where we begin to be mechanech our children in knowing right from wrong.)