It is my understanding from engaging these folks - and even observing myself, regrettably, from time to time that it is not the issue at hand that brings on such behavior. We must be clear that what we speak of is not just disrespect but a form of bullying. And a look at that concept brings us to a better understanding. And yes we can look inward to find some answers.
The person showing the disrespect harbors within themselves the reason for the disrespect. It is not the other person or the victim that causes the problem. Something is just haywire in the bad actor. Anger and fear are the primary causes. And anger and fear are inside jobs. People who are suffering from these two siblings of motivation do not need a platform to ply their trade. The wife who gets beaten does not need to give her husband a reason. The disgusting reasons are all within the husband.
Next time you see the negative behavior go and look at other writings from the bad actor. I promise you will find anger and fear in most of their writings. Regardless of platform. We must just concede that some people are basically angry at the world. Generally these people are leaners toward bullying. It just spews forth. We have a few contributors here that are just constantly angry. And some that just have developed a habit of angry speech without courtesy. I can get along with them normally as I get it, that it is not about me but their angst.
Now as to atheists. The inability to have faith and belief in the unprovable is not a good or bad thing. Just as the ability to have them does not make another any better, just different. We need both mind and "soul" to function. And it stands to reason that some would be more gifted in one than the other. It just is. And it just is that we can choose to nourish one more than the other.
Now one who chooses the more emotional track is more likely to have more sympathy and empathy. The one who chooses the more logical and scientific track is more likely to not worry about feelings and emotions.
So what may appear to be disrespect of another is more likely disrespect for feelings and emotions of another. It is not personal. They just nurture a part that is not concerned with warm fuzzies and politeness which wastes their time.
So if we are atheists or believers we should be patient with those that do not value pleasantness and feelings and emotions. Again it is not disrespect of you but of those notions. Remember there is no rule that says we must be nice.