I don't know if you were home. [He pointed out.] But you certainly weren't here.
I'm not interested in hearing generalities. [He's disappointed, not dismissive.] I can look that up. I'm very good at studying.
Other options:
no subject
I don't know if you were home. [He pointed out.] But you certainly weren't here.
I'm not interested in hearing generalities. [He's disappointed, not dismissive.] I can look that up. I'm very good at studying.