Where was the sexism in it?

Granted, I haven't seen The Lorax since it was released in theatres nearly 5 years ago. While I didn't like the movie, I don't remember any sexism in it? Maybe one scene where a heavy woman's gender (maybe the Onceler's aunt) is confused?

I only remembered this movie when I saw something about it online and I decided to look it up again and the first 3 boards I see are all about sexism/defending the movie's 'sexism'.

What did I miss?