It is an inherent human trait to resist change. We instinctively reject what is foreign to us. But change is a fact of life. The English language has evolved and it will continue to evolve. Short of forcing people to speak a certain way I don't see how you prevent change. Think about it: "colorful" expressions, regional use of language, generational changes, culture shifts and on and on. All of these things influence how we speak. We say things now that people thought crazy and offensive a generation ago. One of the more recent shifts is the use of the singular "they". I personally find it annoying, but a linguist pointed out to me that most of us use the singular form of "they" without realizing it. Bottom line, people can rant all day long, but these shifts are still going to occur.
Separately, this board leans right. I don't doubt that many Republicans think Democrats are insane. I'm pretty sure if this were a different forum you'd be hearing about how Democrats think Republicans are insane. At the end of the day we all use the same language to describe those we disagree with. Republicans insist that Democrats are forcing their views on them and vice versa. From a purely academic perspective I might describe it like this: Rs don't want the views of Ds to force them to change. Ds don't want the views of Rs to restrict them from change. I'm not going to make a value judgement, but from a historical perspective, change is going to happen. It always does.