A simple rule of ticketed transportation is to sit where you actually have a reserved ticket to sit at. People don't always follow that rule, and that's not even a big deal as long as they recognize they're in the wrong place when someone does actually arrive to sit in their designated seat and move. Unfortunately, sometimes people don't, like this Redditor u/Trainnightmare. This user posted to r/AmITheAsshole to ask whether they were in the wrong for sitting in reserved seats with her two chil…