Are all stepmothers are evil?

When I was teen, someday I went to our neighbor's house with my neighbor's daughter. I saw that the woman's stepson wiped the floors with a cloth. When I asked to my friend about him, she said to me 'forget him, there's a lot of houseworks my mom ordered him to do'. Since then, I have always had the image that all stepmothers are evil.
Are all stepmothers are evil?
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