This happens so much and once you are attuned to it you can literally see it happening in public.
We went on a week's holiday at Easter.
First example-
On the plane, we were sitting DS1, DH, DD2, the aisle, then me. Next to me was a woman with 2 seats, she had her plus an 18m old baby/toddler on her lap and a DD of 5 in the window seat. We had booked our seats to be together so I couldn't move as DD2 needed me nearby. The other woman's husband was in a seat in the row behind. Who travels and doesn't book 3 seats together for their 2 young children and both parents? Or - if it's an accident or no seats spare, what kind of dick sits on his own instead of either taking baby in the single seat or letting mum sit with baby in the single seat while he sits next to DD in the double seat?
He watched two films and had some food. He had a lovely time.
Meanwhile, I was helping his wife reach for snacks for her DD, getting her some water, as the baby obviously went to sleep on her; then her DD went to stretch her legs in the aisle and played with another little boy who was flying with his mum. The mum of the second boy did a great job of amusing them both as they played with some toys, she stopped them both getting raucous and was lovely.
But at the end of the flight - THREE women had stepped in to do this dickhead's job, including his wife. Because we don't sit by and leave a child to struggle.
Second example - on the holiday me and DS did a trip that involved some historical remains then bathing in a hot spring. Really nice. Another family were there - with kids about, DS4 and DD2. Delightful children. From overhearing their chat she was something like a biologist or pathologist and he was a lawyer. Again mum sitting with all 3 of them on the coach, dad had a nap in the single seat. He looked absolutely gorgeous- incredibly well groomed, absolutely ripped, designer clothes, carefully shaved beard, clearly spent HOURS each day in the gym to get like that. While she...was great but looked like a nice, pleasant normal mum of three. Healthy but not like a gym bunny.
I always feel a bit suspicious when it looks like one half of the couple has significantly more free time than the other.
At the hot springs they told us we could put mud on our skin and it would be good for the skin. Lo and behold, mum was on changing the kids, getting them ready, testing the water of the hottest pool as it wasn't really good for very little ones... I offered to just guard the 2 year old for a second while she helped the braver older boy climb into one pool. It was actually all mildly dangerous for them.
Where was dad? Well, as I had mentally predicted when I heard about the mud, he went straight in, got all covered in mud all over his buff ol' muscles, and was wading around in the water. Literally as if he had come there on his own. He was just...there.
Next to the family, but not of it. Obviously with 3 young children there is a constant "mum! look! where is my sock? I'm hungry! Mum!" etc etc. In the 5 hours we were together I didn't see him respond to a single one of those.
Oh yeah there was once he spoke to his 2 year old daughter. She was whinging a bit and he told her to shut up. But didn't actually help her or distract her or do anything with her.
Not all men but some men.... and you can see them everywhere.