She clearly is. But I find it forgivable, since the article is actually fairly interesting.

And unlike most people who use the term "sexism", she actually carefully defines her terms. If a normal person says "a pullup bar is sexist", we'd think they are crazy, since we'd be find the moral judgements that person is making to be nonsensical. But because we know her definition, we can simply acknowledge "by your unusual definition a pullup bar is sexist".

She has helpfully enabled us to avoid falling into this trap: http://lesswrong.com/lw/np/disputing_definitions/

The title is very clickbaity, and the author admits as much. I would have flagged it as yet another silly piece, but I clicked and saw the author's name. I'm disappointed she'd drop to a cheap title, and I disagree with the premise that it is sexist. At least for any useful definition of sexist. The way she paints it is like that person that claimed her phone was sexist because it was too big for her to easily take a picture with.

However, there is actually substance there, silly "provocative" title aside.