It discusses that there can be different ways sharing information comes across. For some people, sharing information demonstration that you're smart enough to know the thing. For others, sharing information is for others' benefit.
I wouldn't prefer to interpret "obviously" as "you're not as smart/cool as me if you don't know this", but I can see why there are examples that could come across like that. (I'd sooner interpret it as "I'm not claiming to be smart by saying this").
It discusses that there can be different ways sharing information comes across. For some people, sharing information demonstration that you're smart enough to know the thing. For others, sharing information is for others' benefit.
I wouldn't prefer to interpret "obviously" as "you're not as smart/cool as me if you don't know this", but I can see why there are examples that could come across like that. (I'd sooner interpret it as "I'm not claiming to be smart by saying this").