> Also nothing signals undateable more than "I l[i]ve with my parents".
This is cultural though. In the US that certainly seems very true. In other places (such as where I'm from), living at home with parents until marriage is the normal default.
Cultural...and economic. I guess in places where there are arranged marriages, or living together is shunned upon, this is true. However as far as I can tell generation z is complaining about the economic situation that disables them from moving out. So it's definitely not cultural there.
I'd rather live in a tiny studio with just a mattress than live with them. Also nothing signals undateable more than "I love with my parents".