The movie follows the exploits of a band of evil men, termed droogs, moving about a utopian socialist Britain. I think that is an important aspect of the movie's message. These young men aren't stealing loves of bread for starving loved ones, they have every material need supplied by a generous government. Yet they are evil.
IF the movie showed women "asking for it" by dressing or acting provocatively, then excused the droogs on that basis, YEAH that would be misogynistic. Big Time. This movie does the opposite of excusing or justifying violence against others, it condemns it and uses it as a premise for what happens in the 2nd and 3rd reels.
Where it might be sexist, I suppose, is that women were victims to evoke greater sympathy in audiences. Is it sexist to think women are inherently weaker or less capable of defending themselves? Is it sexist to think viewers will be naturally sympathetic to a female rape victim. Maybe, but that's a bit of a stretch. (And the 2nd Amendment empowers women to carry an equalizer.)
The hard thing about good and evil is knowing the difference. There are things that I think are evil, that if I told you, you'd think I'm evil for thinking them evil. Should those things come up, I'll depict them as accurately and as honestly as I can, while leaving the reader to make his/her own mind up about good and evil regarding these things. Other things like rape, murder, and assault are not in this category, the writer can express disapproval, but the wise writer doesn't hit the reader over the head with a moral club.
BUT suppose I tell you a little more about this white boy who uses the n-word: He's a fugitive and he's helping Jim, an escaped slave, get away down the Mississippi river. And the author is playing a sly game of showing a noble black man surrounded by white savages. Huckleberry Finn is in the middle coming to realize Jim is a better man than the whites known as "the duke" and "the king" who are scalawags.
When you find your story taking you into something you don't approve of, you should tell the truth of it. If it's something we all agree about like Nazis, we'll understand the irony of Springtime for Hitler. If it's something like rape and murder, it should be clear you're not endorsing it. But a reader like my friend can err by thinking it's misogynist or racist.
That's a risk, but I think the game is definitely worth the candle.