There's no contradiction. Sexism can express itself both in putting women down and in putting women in a pedestal.
The rest of your comment is trash.
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Since she didn't include a direct quote, or more detail, it's really difficult to say much about the supervisor jumping to her defense. It's clear that, in hindsight, she viewed it as sexist. However, a little more detail on what was said, or the nature of the situation would be helpful to understand it better.
It's not unusual at all, to me, for a supervisor to defend members of their team...and not automatically sexist, or even undesirable.
There's no contradiction, if the witch had led an evil and improper life, she was guilty; if she had led a good and proper life, this too was a proof, for witches dissemble and try to appear especially virtuous. After the woman was put in prison: if she was afraid, this proved her guilt; if she was not afraid, this proved her guilt, for witches characteristically pretend innocence and wear a bold front. Or on hearing of a denunciation of witchcraft against her, she might seek flight or remain; if she ran, that proved her guilt; if she remained, the devil had detained her so she could not get away.
From Friedrich Spee von Langenfeld, the Cautio Criminalis ('prudence in criminal cases') in 1631.
In fact, I believe arguments are attempts to converge to truth. The fact that women were victims in 1631 has no bearing on this discussion.
RoderickDay made an argument that happened to be flawed (here's a more formal argument illustrating the flaws: http://lesswrong.com/lw/ii/conservation_of_expected_evidence... ), and his argument paralleled the Inquisition's arguments which were flawed for the same reason. Now that his incorrect argument is rejected, we can make better arguments and approach the truth.
I will assert that such "positive" acts can be and often are sexist. Negative actions can also be sexist. It is possible to take a sexist action while you think you're being helpful. Not all sexism is manifested in malice.
Consider similar racial stereotypes like "Asians are good at math" or "black people are good at sports." You might think that someone is positive, but those beliefs are deeply rooted in racism and racial stereotypes.
If you want to make a more complicated argument as to why these things aren't actually X and !X, do it. But RodericDay wasn't doing that.
For those who doubt it: yes "benevolent" sexism (or racism) is real, unfortunately. There are many ways it can manifest itself, but what it always boils down to is someone with the proverbial "good intentions" who decides to treat someone differently, even in a way they think of as positive, for no other reason than because of their sex (or race). It can be particularly poisonous because once you call someone out for being different, even if it is in a way that you believe to be beneficial, it highlights to everyone around them that they are different, which can make them a target.
The best solution is to always strive to treat everyone equally. People are not perfect, so there will be mistakes, but that should nevertheless always be the goal.