I’ve never heard of this until now, so take it with several grains of salt.

I’d imagine the complaints stem from the fact that she was never in charge of the country.
But then they should have complained when Ben Franklin was announced.
Or maybe they did complain when Ben Franklin was announced, but you can’t really go “look at these bigots hating on Benjamin Franklin,” so that wasn’t shared around as much.
Of course even if that were the case, there would be people who draw the line at Tubman and not Franklin anyways, which could be a case of actual bigotry.
Or maybe a significant subset of the audience wasn’t taught in school that Tubman was that influential, and sees this as blowing a historical figure out of proportion.

My hands are now unspeakably filthy as filthy people following the signs have accumulated a ton of germs on this handle. I get sick.

Do you normally get sick when you touch a bathroom door handle? It’s not like people choose not to wash their hands because there’s a separate handle for it.

If I had to guess, ‘railway’.