Yeah, the vast majority of people would see it as erratic to break up with someone for not responding to a text within a few seconds. It's not culture or technology that's the issue, but the personality of the anxious person who ask to break up over just that.

I think it's both the individual personality as well as growing up in an online world. I'm not an expert but I'm thinking it has the power to actively rewire a person's brain. If in your entire lifespan so far you do not know any better than for everything to be available always and instantly, that creates an entirely different creature.