Your observation about the culture being worse is accurate, but none of them are caused by tech.
Personally, I believe it does. It's even ironic to me that your comment was downvoted, like, why? Is this really how we think about the world nowadays? Dislike/like. No discussion.
Anyways, I have to say Hackers News has been the source of well spent evenings with this nice community, so there's at least one data point there that these changes in culture weren't caused by tech.