I don't think any of mine have talked to Larry a lot, but Tesla probably assumes he's something like an Abnormal (ie: something/someone with non-human abilities)
(That assumption comes from a combination of Larry mentioning his film star bff and also the fact that Yunlan would be surprised if Larry went to a lot of effort to form close friendships with anyone -- so the closest friendships are most likely to come from people who are willing to pursue and interact with him.)
For non-sexytime...more pondering than assumption, he wonders if Larry feels connected to the modern world having lived through the decades and watched things change, or disconnected from it due to not going out much.
the second question is an interesting one I try to keep in mind because he seems to be much more culturally aware than I think one would generally expect him to be at his level of shut-in
so he's keeping up to date somehow -- I headcanon that he definitely keeps up with the radio, less so with the TV, and maybe sometimes uses whatever computer Cliff snatches to stalk Clara's Facebook that one time
They totally should be friends