Do MIL's who've never raised daughters (only sons) have a harder time showing respect and being considerate to their sons girlfriend/wifes than MIL's who HAVE raised daughters?

I'm asking this bc of observations I've made. my dad's mom for example, had two sons. no daughters. she babies them both, ESPECIALLY my dad. I find her justifying his wrongdoings often, over my mom, over just about anyone. Her and my mom had a hard time getting along at first, and still sometimes do, because of how badly my grandma babied my dad. My grandma wanted to hold his hand through life, which meant she was very inconsiderate towards my mother when she got pregnant with me.

Also, my boyfriends/future baby's fathers mother. Her and I DO NOT get along. She has three sons, no daughters. She disrespects me, and I feel like she's always thought my boyfriend was "too good" for me. she treats me as if I should automatically respect her, while she treats me poorly and avoids any type of conversation with me. her and my boyfriends BROTHER's girlfriend also had the same issues in the beginning, but those two finally built a better relationship and they get alone now. but this woman is entitled, fersure.

Basically, I feel like maybe some MIL's who have never had daughters and have only had sons, have a harder time bonding and respecting any woman in their son's life... vs MIL's who HAVE had daughters. why does it feel this way?