That's pretty much 100% the wrong way to look at it. Take the SS agent's sex out of it.
I think Trump, or Biden, or any other protectee, should have a reasonable expectation that the people protecting them can (I chose that word carefully... "can") actually step between them and a bullet, providing a physical barrier to being assassinated.
If she, or any "he" of that same height were to attempt to shield a protectee in that way, they would fail.
Not because she's a woman, or because "he's" a man, but because they're too short to do the job.
I believe 100% in equality. But the fact is that not everyone has the physical skills necessary to do certain jobs. For example, men don't make good wet nurses. Maybe not the best example, but a pretty easy to understand example.
That's called reality. And if people get all twisted over that, it's their problem. Peoples' lives are at stake. They need to get over it and worry about doing the job.