If they have an issue with this as far as self-esteem, then I'd imagine they have an ego problem.
it might be fair to call the fragile male ego a problem, but it is also often a fact.
My husband doesn't have a problem with it - and he is a former Marine and "manly" crap. I think he has a strong self-esteem to begin with so he could care less if some one thought or said otherwise.
nobody is enough of a lone wolf that year upon year of constant disapproval from those around them does not have an effect.
Did your hubby retire? If so that changes everything...guys who brought in a living wage for 20 years, and set up a hefty retirement fund have already contributed a huge chunk of change, they are neither disrespected at large nor do they using have self esteem problems if they choose to be stay at home dads....this was true even 15 years ago.