The airport's definition of "Pride" is being on the lookout for people they think are trans and telling them to use the trans bathroom?! And security personnel confronted you because they didn't like the pitch of your voice? Talk about being tone-policed!
Someone else recently shared a story (I forget who or where) about being gender-policed by security at a Pride-themed nightclub event after they entered the all-gender bathroom. Clearly all-gender doesn't always mean "trans people too." Any "bathroom" becomes an excuse to "question the trans person." They don't want us anywhere.