Why do some modern women marginalize a mans role as a provider ?

When a man is the sole breadwinner of a family modern women consider him lazy, unless he does half her work after being done with 100% of his work at the office. Is it because he is "trapped" when married with children and he doesnt really have a choice to provide or not, because she is well aware that she can enforce a payout out of him by court ? Do modern women marginalize a mans contribution because they are well aware it is not subject to his generosity but can be enforced by court ?