Proving this is nigh on impossible and imo pointless.
If there are enough rocks around to bounce off, try avoiding them. This happens in or out of combat.
From battleships down, fight in a roid field and you'll bounce. A lot.
Try fighting in a small ship in Omega 5 for example.
If you're in a destroyer in Tau-23 and an angry Mafic or two are after you, flying in turret view is a must.
Nothing else will cut it.
Transports avoiding pirates in Tau-31. Are they too commiting abuse?
Calling it abuse would be niave. Sanctions for it would be a farce.
Sun diving?
Abuse?
It's still a PvP death if you dropped his shields 50%. He was in combat. Docking?
PvP death.
Is this the new version of the blue message brigade all over again?
Can't get that message the traditional way so we are going to invent new rules in order to get it?
Asteroids, suns, bases. They are all there. You know that before you start combat. If you think you won't like the way he fights in a situation, don't fight him. If he's a better pilot in the rocks, fight him elsewhere or don't.
If he can fight in the corona and you can't stand the heat, keep out of the kitchen.
If he docks on a base......get some RP going to change that for next time.
The enviroment you fight in should form part of your tactics, just as it has throughout the ages. If you don't want that, have them all removed from everywhere. Don't add more rules to make up for your lack of imagination.