The “armrest elitist” feels entitled to take your armrest for the entire journey.
You may want to defend your territory in some way but you do not want to look petty.
The armrest hog may even have taken both armrests and in the worst case you may be in the middle of two hogs, leaving you with your arms pinned to your side.
While there can be well behaved children on a flight, generally most people are fearful when they see children especially if they are sat anywhere near them.
“The aisle clogger” or “The Procrastinator” includes the passenger who does not notice the line of people behind them trying to get to their seats.