Dorkiest dialogue in the series

I think that in ME1, they also wanted to hammer down the idea that humanity is still very new to this universe and people (including Shepard) don't really know that much about all the alien cultures out there, especially not those they don't have to deal with on a more regular basis like the asari or the turians. It may have been a bit overdone in those two particular instances (and especially doing it with the player character was a bad idea) but in general, I liked that sense of wonder humanity still had in ME1. See for example also that young human C-Sec officer in the wards, who is super excited that he gets to be on the Citadel and see all those weird aliens.

Of course, ME2 largely retconned that entire idea and made humanity into a pretty much fully integrated part of galactic society with multiple colonies just about everywhere (including both, the terminus and right next to the Citadel for some reason if you look at Kasumi's mission). I honestly thought that was a shame much more than the human's cluelessness in ME1.