Because license to interrupt often gets applied unequally WRT gender. Smart women go where their career isn’t impacted by boorish behavior.

Interrupting in conversation is not inherently “boorish”, or inherently male.

But there’s obviously a big difference between interrupting someone in the middle of a large formal work meeting in front of an assortment of colleagues vs. interrupting someone in the middle of a small collaborative technical discussion in a closely-knit team. The former is often more about demonstrating perceived social superiority rather than guiding a conversation, and such behavior is boorish.