That is definitely part of it. Impersonal forms of communication significantly (and for the most part, negatively) impact interpersonal relationships just in general and perhaps intimate ones especially so.I wonder, if some of the movement is a response to how communications have changed. It seems more and more common that people don't date from a pool of people they know, and friends of friends, but rather through online dating services. While I've seen successful matches from this(have a few family members who this worked for), it removes some of the humanity from these experiences and makes it more like 'product'. Being as the incel movement seems most prevalent in younger men, I wonder if this push of 'attraction' being more like marketing than relationship makes it hard to relate to women as... well, human.
The larger part of it, though, is that women actually have rights now. They vote. They own property. They are independent. Which means males are no longer culturally entitled to own them. And some males simply cannot deal with that and want to "put women in their place."