Even going as far as calling her husband an asshole (might be true, I’m not married to the dude).

You misunderstood the text, the sentence is :

If only I got a penny for every time someone said: you don’t look like a computer scientist, I could be Mackenzie Scott without having to marry an asshole.

She’s calling Jeff Bezos an asshole, not her own husband.

Bash has an option for that you can put in your .bashrc:

bind "set completion-ignore-case on"

Other interesting options exist