What do you think about me saying that my husband is being a stubborn idiot?
It's not okay that you feel that way. Do you plan to tell him that in person?
No. I'm going to say it on a social network instead
You shouldn't call anyone including your husband an idiot. You shouldn't do it on social media as well.
If I like, why not?
It's wrong to try to humiliate your husband on social media. If you are upset with your husband you should talk to him about how you feel, instead of being disrespectful.