If you go below and ahead of the group, your bubbles will ruin it for everyone in the group as they would have to swim through that, so, that behavior in my view deserves an enthusiastic hand sign.
If you go below me and create a bubble curtain because you don't care, I might break your heart. Why respecting others and being considerate is so hard? Why can't you dive in that big ocean so, that others are not disturbed?
Behavior?
Respect?
I think the lower diver has the right of way because of tissue loading, consumption and the natural blind spot that occurs. If bubbles bother me as the diver above, I can simply move left, right, fore or aft of the lower diver's bubble stack and continue on my way.
If the lower diver is ending up there because of a basic lack of control or scatter-brained navigation from narcosis, bubbles are the lesser of the problems that need attention.
You may have a lot of dives and be a certified DM or instructor but I think your outlook would benefit from a more practical outlook.