There's a lot of things to think about in that photo, but one of the most shocking things is the date. 1967.
This is from Switzer's wikipedia page:
In response to her run, the AAU banned women from competing in races against men—women had not previously been explicitly excluded. Five years later, in 1972, women were first accepted officially to run the Boston Marathon. Switzer finished third in that 1972 race and Semple presented her with her trophy.
So, there wasn't even a rule that forbid women from running in 1967. They just acted that way because all of the organizers held the bigotry in their hearts.
Maybe to some young'uns here, 1967 seems like a very long time ago. But it really wasn't. Switzer herself is 78 and still making appearances.