Well........I don't think so?
People love Morrigan from DA:O and she's pretty much a jackass. Made me want to pull my hair out at times, but there's a charm in that making a bad girl go soft in the end.
We shouldn't just slap or imply a "sexist" label when people don't like a character or not, although there's always going to be a variance.
Is there a good example or reason they say this or are they just guessing?