Data point: I’m millennial (born 1992) and have a pretty strong aversion to phone calls, which is motivated mainly by the fact that I prefer most communication to be non-real-time so that I can take time to think about what to say without creating an awkward silence. And when I do engage in real-time communication, visual cues make it much less unpleasant, so phone calls are particularly bad in that I have to respond to someone in real time without either of us seeing the other’s face/body language.
If I had to take a wild guess at why this seems to be generational, I’d suggest that older generations spent much of their lives with phone calls being the only way to quickly contact people far away, and prefer them due to familiarity. Perhaps if they’d grown up with email/texting being options, they’d be more likely to prefer them instead.
The lack of eye contact is very surprising to me. At the risk of sounding braggy, the two times I’ve spent a non-trivial amount of time in a nightclub, I’ve gotten multiple female strangers holding eye contact with me for a full second or more (sadly none of them led to sex as I’m hella introverted/awkward). Does, uh… does this mean that I’m… hot??? I don’t really think of myself as hot—I am 6′4″ but apart from that, my appearance is pretty average. And the hypothesis “it’s because of my height” still doesn’t really feel like a satisfying explanation for the difference between my observations and yours—I was under the impression that women’s attraction tends to be fairly “holistic” such that’s it’s very rare for a single attribute (such as height) to be sufficient to give a woman the hots for someone (though not so rare for a single negative attribute to break a woman’s attraction to someone). Perhaps the difference has something to do with the venue/context? Like for some reason women are more inclined towards eye contact at nightclubs specifically, more than house parties or events that are explicitly sex-focused? I don’t know why that would be, though.