His cursing is bad, but his defiance and defense of it is worse. That's appropriate for a five-year-old, and a badly-behaved one at that. I'd seriously consider divorcing him and marrying an adult. Sounds harsh, but what kind of person is willing to hurt his kids rather than man up? That is wrong in so many directions. A lifetime of tantrums like this, as an example to my kids of how grownups deal with life? No thank you.