Most American Men are Horrible at Friendship

I had a lot of friends when I was in high school and in my twenties. Then we all moved to different areas, got married, had kids. None of them reach out to me anymore except a select few. The ones I reach out to usually don't reply, or it's a one or two sentence response. No one wants to meet up or talk on the phone. Some of these friendships have been made permanently awkward or ruined by online arguments on Facebook. I'm preaching to myself too, I'm horrible at maintaining friendships and I've made some mistakes.