The scene: fast food restaurant.

"A hamburger for me, please, and a chicken sandwich for they."

A blank -- or maybe even a bit "strange" -- stare from the clerk.

"Ummm... I mean for them." (Or _do_  I mean 'for them'? What do I mean?)

Clerk thinking hard. Then, understanding dawns. "O.K., two chicken sandwiches and one hamburger, right?"

"No, just one chicken sandwich. For them. ... They. ... Whatever." Whereupon an undercover gender-pronoun cop jumps out from behind the big sign that says "Large fries free with any order all day today" and hauls me off to jail, because in this context the "whatever" might constitute hate speech, and only the court can decide.  
...
BTW: If there is only one transgender person present, is it still: "They _want_ a chicken sandwich?" Or is it supposed to be: "They _wants_ a chicken sandwich?"