For many men, the only reason to be respectful to women was because they expected to "own" or dominate one one day.

That was the selling point of marriage. Young women were told that a nice man would marry them, support them and protect them. They found out after the fact that the nice man was who you needed protection from. There's a reason why women balk at certain phrases. You might not agree with them, but things don't happen in a vacuum.

You men were told to pick out a pretty young girl to marry so you could be a man by provising for and protecting a family that she would give you a long with dedicating all her considerable energies and talents toward your ease and comfort, your advancement, blah blah blah. You'd get sex whenever you wanted it and there would be no complaints. She would willingly and joyfully become an extension of you because God had ordained women to be the helpmeets of men.

Once that was off the table, their true feelings about women started to emerge more.

They started seeing women as competition. Or as evil. Whatever.

It's like they think our autonomy steals their manhood from them or something.

Marketing propaganda that uses sex and sexuality, particularly female sexuality to sell products hasn't helped.

Dating apps.

PUA culture.

Social media.

Drugs.

All these things and more have been factors.

Our whole culture really changed post WWII. Certain things were set into motion then that seem like inevitabilities now that they would lead to what they've lead to.