"Why do we always refer to female public figures by their first name, and male ones by their last?"
I heard/read that question somewhere, and it stuck with me, can't stop seeing it. And this is a fine example of that.
Google results:
"Clinton email scandal" 41M results.
"Hillary email scandal" 48M results.
Yes, I do realize hers is a special case, and it's necessary to use her first name to disambiguate wrt to Bill. But the phenomenon exists. Just some thing to keep in mind.
[Edit:
"In the tennis commentary, women athletes were called by only their first names 52.7% of the time, while men were referred to by only their first names 7.8% of the time."
http://www.la84.org/gender-stereotyping-in-televised-sports/
]