That's just strategy at play. It's not dirty to take advantage of a situation. If someone doesn't want to die after taking fall damage, don't fall!
The few places where that is even applicable, there's usually sub-ledges or a nearby ramp to get down anyway.

And while you can report players for whatever you want, this isn't in any way rule breaking. If you want the honest answer to your question, yes you likely wasted your time with that.

Things that are against the rules would be stuff like non-participation of intentional feeding yourself to the enemy.
Report people that do that.