You so often here arguements that go something along these lines:

Her: There are a LOT more people who sit to use the toilet, than there are men standing to use it.

Him: Is it really that hard for you women to put the seat down yourselves? I mean really? Too afraid to touch the seat? I don't buy it.

Her: YOU put the seat up, why should someone else put it back down? You put it up, YOU can put it back down.

Or even better yet:

Him: Sorry, but if you are not smart enough to check that the seat is down BEFORE you sit than you deserve to fall in

Her: That's the point, I shouldn't HAVE to check to see if the seat is down. It should be down already, where it belongs.

What is the best argument you have for advocating for seat-checking and that there is no default toilet seat position? Personally I feel that men have to check the position every time they use the toilet, and women do not (or, would not). So why should there be a default setting?

Alternatively, one could argue that, okay fine, how about instead of men placing the seat down every time, that EVERYONE put the seat AND lid down, every single time? That way, everyone has an equal amount of toilet seat prep work to undertake. Equality for all.

EDIT: I guess you could also get into the matter of kindness vs. obligation. Is a man OBLIGATED to lower the seat, or is it a courtesy?