A restaurant manager asked a dude to use the dude restroom.

Here horrible.  If one has/had a dick, you're not a chick.  Anyone claiming otherwise is an idiot.

https://www.yahoo.com/news/trans-woman-says-manager-jersey-190305330.html

So, most if not all female-designated restrooms have stalls with doors, right?  Who looks into occupied stalls to check the user's private parts? 

Unintended consequences of the LBGTQRSTUVWXYZ movement. 

Everything new has unintended consequences.  They get worked out in time.

Candy

You ought to hang out with the younger 20ish male conservatives you will find out most of the ones that aren't inels prefer chicks with dicks over genetic females.

This is an ongoing kerfuffle with conservatives. Another thing to get outraged about.

What I want to know is how anyone, that restaurant manager or anyone else, can definitively tell someone's gender identity by looking at them anyway.

And that aside, I can see how a transgender person might feel more comfortable using a bathroom with a stall, and women's bathrooms have more of them than men's bathrooms. So why in sweet holy motherfuck get upset about it if someone wants to use the women's restroom???