What disturbs me is that it seems like she doesn't know the vid exists since she told him to delete it -- which will imply he recorded it without her consent (it was recorded literally behind her back, too, giving more credence to the suspicion). Even though she doesn't seem to mind it too much, just want it to be deleted, it's not nice he did it in the first place though.
The best possible case is she just want him to delete it from chat (so, no one accidentally see it, maybe?). But... I think she can delete that from her side without him doing so, so it's a bit weak as a counter argument.
chat why are you white knighting a manga character
I feel like we just find it disturbing that it appears to be unconsent, but presented as something totally normal and harmless, which is not okay and should be pointed out that, no, you shouldn't do this to your partner. And its not something so obvious like rape or murder that doesn't really need anyone to point out you shouldn't do it.