Don't know what kind of students you're thinking about - I can't imagine anyone more intensely social than a group of freshers?
[1] https://abcnews.go.com/US/teens-spend-hours-screens-entertai...
[2] https://www.theguardian.com/society/2021/mar/02/nearly-four-...
[3] https://www.npr.org/sections/health-shots/2018/05/01/6065885...
https://www.bu.edu/articles/2021/campus-life-why-are-student...
https://www.theguardian.com/lifeandstyle/2014/jul/20/lonelin...
[4] https://www.theguardian.com/lifeandstyle/2020/jun/13/young-a...
[5] https://jamanetwork.com/journals/jamanetworkopen/fullarticle...
Now, even though 2003 is already after the start cutoff date (a first major development being the web's post-1994 huge adoption), the contrast between it and say 2013 (in between which dates smartphones and social media were widely available) would already releal huge changes in those aspects.
Except if the changes became invisible even to someone in contact with students in a kind of "boiling the frog" incremental familiarity (where it had been slowly but steadily increasing each year, but the infra-year difference didn't seem important).
You said it. Including before covid.
>while denying the simple science that some people might feel differently about socialization than others.
Yeah, It certainly is just "differently", can't be worse. That's why depression is sky high among the youngs, loneliness and isolation is reported as having rocketed, and so on (and that's already pre covid).
Well, since it works out so well for them...