Is there any way to prevent users from changing background color of their post? I removed the button from the editor bar, however when they copy/paste content into their posts it seems to store bg color information which they have absolutely no way of removing besides using the remove format option which removes absolutely all the formating and not just the bg color.

I'd like to be able to make it so it won't allow the bg color of a copy/pasted post to actually parse.

Add this to your custom CSS file:

 

.cPost_contentWrap.ipsPad .ipsContained p span {
  background: none !important;
}

 

Is there no way of handling this on the editor side of things rather than adding something to css to simply over-ride bg colors?

Not that I know of. I checked the BGcolour settings on the editor in the Admin CP, and there doesn't seem to be a way to do that.