Essentially the sexism is almost always on display but never examined.
Ciri sits in the middle of a group of crass men, gets told how weird it is for her to be a woman traveling alone, says she's good at riding horses, to which one of the men says he's never seen a woman ride anything properly other than a cock, to which Ciri's only response is to jovially offer to compete in a competition.
No part of the writing allows room for Ciri's experience of dealing with this kind of thing, nor do any of her reactions even acknowledge what she's facing. As far as her behavior is concerned, she's being treated no different from the men around her.
There is a glaring lack of women represented in any position of power, but again, this is not examined. No one talks about it because it doesn't matter to any of the characters.
At the same time, the sexism is intentionally kept in check so as to keep it tolerable for its target audience. It is used as a tool to make characters less likeable, but it is conveniently absent when the audience is supposed to root for someone.
See also: homophobia. Used to create a sad backstory for an NPC but otherwise completely unacknowledged despite the likelihood that 99% of the people you'd encounter in that setting would be bigoted garbage cans.
