I'm surprised you find it near offensive, Lass.
I'm musing because I can see real cultural differences in how men and women interact where I now live in England, versus where I grew up in Scotland.
Neither is an amazing model, but I often find women here more deferential to their male partners' opinions than I am used to. I grew up with country folk who were not deferential to their husbands, in speech anyway.
And I find when I work with Scottish men, they interrupt me less and listen more, than many of the English men I work with.
A majority of the men I work with are senior in their industry and public school educated SE England, but I see this dismissal of women's opinions from men from all over.
None of my Scottish Facebook chums have ever started a YOU'RE WRONG argument with me, for instance. And men start them with me all the time.
I think there is a strong link between how men interact with women domestically, with how men treat them at work. Perhaps it's class, perhaps it's culture (country/industry/company), perhaps it's how I present as someone who speaks with a different accent maybe it is all my fault. But I think it's important to explore why men feel compelled to dismiss women's opinions, because it has real impact and I imagine they won't change their behaviour by themselves.