> I suspect almost everyone has some secret disagreements with their in-group

This is assuming they have anyone close enough to even call them an in-group

I think there has been an over-emphasis on individuality and a strong resistance to conformity that has been instilled in a lot of people, which has led to a lot of those people cutting ties with anyone that has even minor disagreements with them

They are forever in search of their perfect friend group that doesn't exist, made up of only people who agree with them about every single thing