I'm not going to stick up for my girlfriend when people were being toxic and aita for not giving into her unreasonable requests
Why don't you want to defend her?
I don't like to be involved in other people's quarrels
If he requests were truly unreasonable, then you shouldn't be obligated to fight for something you don't believe in. This will cause her to be more reasonable in her future requests and quarrels in general will be less frequent.
He looked like he was waiting for me to fight, but I would rather avoid the fight.
It is smart to avoid fights. No need to escalate something if you don't have to.