Honestly, when it comes to public transit, just don’t stare at us or treat us any differently. If you do have more direct communication with someone, you only need to signal allyship when it contextually makes sense, or when you think they actively need the allyship. Offering help at the right time is the sort of ally opportunity you should look out for. Other than that, just being cool, nonjudgmental person is all you need to worry about. If you’re chill vulnerable people will trust you.