You really can’t grasp the concept of manipulation been a part of mental abuse can you?
I can. People can be manipulated and groomed into doing all sorts of stuff, often to their own detriment, especially young people. Similarly, people can groom and manipulate others. I just don't think it applies in this case and it is too often an used as an excuse to avoid responsibility.
Will Smith is a middle aged man, not an immature head strong youth. He's managed to be disciplined and driven enough to forge a career as one of the world's top film actors. The idea that he is somehow under the thumb of his wife and that she somehow compelled him on stage to defend her honour seems unlikely. It suggests Will Smith has no control over his behaviour, which doesn't seem to be the case in any other sphere of his life.
Jada Pinket's response to the Chris Rock joke was to roll her eyes. Which seems like a fair and reasonable response to a poor taste joke. That Will Smith decided to take it further is on Will Smith and nobody else.