I would argue that it's more ironic and less parasocial than calling someone Daddy. There is an implication of less closeness, and uncles/aunts aren't as societally revered as patents, especially cool uncles/aunts.

I also think there's less of a parasocial dynamic since we tend to approach these people from a materialist standpoint. These folks are compared to a cool uncle because they introduce ideas outside of the traditional education we receive from parents, not because they are aesthetically like a parent we can project our vague wishes onto.

Like the presupposition of closeness isn't there.