Husband foul mouth w/ the kids!!!!?

Am I imposing myself on my hubbie when I ask him not to curse at our children or call them names when he's upset. Names that began with harsh curse words like "MF you better hurry up in that kitchen" to our sons. I know that the boys are not technically my kids (stepsons), but I parent them and care for their self-esteem. My hubbie is giving my the guilt trip and saying that I don't trust his parenting style and that he only occasionaly does this. He is also convinced that the reason he's so mentally tough is due to his mother and father not holding back on their expressions with him when he was a child. He believes that he is doing his children a disservice if he "so called pity pats around" and not talk like this to them. He also used me as an example: Last week I came home to talk to him about my boss bullying me, but he uses the example that if I was trained to be mentally tough as a child, that my bosses words would not bother me one bit. I am just frustrated? Am I wrong?