>>509543029The person in question views everything as an US/THEM scenario (look up "friend/enemy distinction"). If someone's behaviour doesn't fit (like someone they think is an "ally" going against their interests or someone they think is an "enemy" working towards their interests) it makes them start to question their view of reality.
I don't need to tell you how that might cause some unpleasant thoughts for someone trying to live as the opposite gender.