There are many issues apon which we can be divided, but we have what makes us human in common.
As for society getting more antagonistic, it's possible upbringing and present environment may have reduced society's average level of good manners, regard for others, and desire to disagee gently, but a) I suspect it'll prove to be a random blip longer term, and b) there are plenty in the PC group trying the other extreme.
It's all rather complex and difficult to analyse properly, and come to conclusions one can be confident about.