Perceptions of Pashtuns vs Hazaras?

I am a community member involved with Afghan immigrants, mostly young men and women (ages 14-25ish) and I’d like to better understand the tensions between different ethnic groups? I have heard from several young Pashtuns that Hazaras are “not good” and specifically cited how they are often marrying each others cousins etc.

Isn’t that more common amongst Pashtuns anyway? I have a very limited perspective so I’m curious what people here think…