They clearly have a negative stereotype of women in their minds, and that's the lens through which they judge the behavior of all women. So if a woman forgets something, it's because "women are airheads". If a woman is upset about something, it's because "women can't control their emotions". And if a woman is good with kids, it's because "women like children, that's just natural".
And when a woman behaves counter to his preconceived ideas, she's a bitch.
When all examples they ever give for anything consist completely of men.
Have you ever looked into a reddit post on a topic like "Who are the best actors of all time?" Thousands of comments, nearly all male actors. "Worst actors?" Also all men. "Examples of this trope?" Only scenes with men. Stock photos or drawn figures to illustrate their point? You guessed it – all men (unless it's sexist in another way).
For some men we just don't exist as people of equal significance.
Indeed, when I started at my current job there was a Anglophile guy who was really into the Beatles and other "classic rock" groups. Being from an English speaking country he was keen to talk to me, at length, about music.
After a while I noticed that he never mentioned any groups that even had one woman in the lineup, I started asking his opinion about the likes of Janis Joplin and Heart, and he just kind of locked up.
He will now say a frosty hello to me if I prompt him directly, but that's about it ... he has two daughters who don't talk to him apparently.
I've started seeing a few more comics/memes which have women as the representative of a universal experience (rather than, as you say, representing a sexist trope) and it's absurd how happy it makes me.
Bitterness in the tone, even if it's just for a second. Maybe a slight eyebrow raise or almost eye roll as well.
No patience with women having trouble with driving, DIY or other things women are more likely to struggle with.
Often makes disparaging remarks about famous women, for example tears apart a politicians views or ridicules a female performer. Doesn't seem to do that with men.
That is a stereotype. Might some of that be due to the fact that driver's seats are designed with men in mind, and tailored to the average male body? Maybe.
Also it's worth noting that men are more likely to be involved in fatal accidents than women.
Here in the South a telltale sign seems to be when they talk shit about their wife with their friends, it's like a point of commiseration that seems to generalize to misogyny, the whole "women, eh?".
Hates feminists. Shits on female celebs and drama around them but not male. Brings up how dumb all the women their age are a lot. Watches certain youtubers that are right-wing manosphere types. Common bs like men are logical, women are emotional, praises men for sleeping around but scolds women for the same, etc. Mention the gender pay gap and they say men do dangerous jobs while women only do cushy jobs as an explanation. Is a conservative religious type or says they are in the center / don't like politics but when you mention an issue about women it is brainworms galore. If two women appear to take the same sides in an argument, it is only because they are both women. Talks shit/complains about women in a generalizing way.
TW:SA
They say women lie about rape a lot and just by being accused, the man's life is all over. Even when a man is found guilty, it is because everyone is biased and thus we should not believe women. Says rape statistics are overblown, etc.
Talking over women, repeating what they say, as if they said it, to give it "authority", not asking questions, but just making statements, "correcting" women after they speak, either rephrasing it, or correcting minor grammar or pronunciation, (that's questionable to correct, usually nit picky and way too formal for anyone to actually use, nowadays) while completely detracting from, avoiding or distracting from the point she's making. Minimising any mentions of struggles she mentions or people in general mention, that women face, especially if men are the cause. Anyone who says not all men, or bullies someone into saying it, double points if they just focus on not all men-ing and don't even mention the original point the op was making. I could go on.