"rocking the boat" means stirring up trouble. To rock the boat means to disrupt things, promote disharmony, make waves, pick a fight, causing trouble, disagreement...
On a boat, if you rock it or cause waves it can go over and I think that is where the saying comes from.
I'm not a trouble-maker. He told me about rocking the boat when I apologized to him. But he was the one who yelled at me for something that wasn't his business.
One man told me, "You can rock the boat all you want." when we got into an argument.
It's not the right time to "rock the boat". We still have to wait proper time.
Don't rock the boat yet. I will make it up to you.