Modern day housewife... sexist?

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I'm getting married in 6 months and both my fiance and I agree she'll stay at home. Though I'm young I have a very good, stable job that can easily support the two of us, freeing us up to spend more time together outside of work, and when we eventually have children (maybe 2 years), she would want to stay home anyway to raise the children rather than have a nanny raise them for us. This is her choice and I've asked her many times if she's sure, and that I would support her if she still wanted to work, but she said this is what she wanted, and we're both okay with that. We've discussed this thoroughly, covering everything from finances to responsibilities to how she'll spend her time. This wasn't a one sided or rushed decision. However, the reactions we've gotten to this have been almost entirely negative. I've had different reactions ranging from me being a dominant chauvinist to her wasting/ruining her life to some even thinking she's uneducated, talking about community college classes or taking up a part time job at Walmart, yet this is a woman with a Bachelor's degree in IT who had a very good administrative job. She left it because she wants to become a homemaker. In my eyes, it makes her happy and it's what she wants so it shouldn't matter, but to others, they think it's a huge step down and almost seem to scold her for it. So what do you guys think? In this modern day and age, where both men and women are expected to enter the work force and further their careers, is being a housewife/homemaker considered sexist and a step down from the social ladder? How do you feel about it, or rather, how would you feel if one of your female friends wanted to quit their job to be a homemaker? Are any of your homemakers? Thanks for the responses, guys.