I hate junglers coming to lane and taking my exp as much as the next player, but...
"when I get solokilled because the enemy Zed hit level 6 before me. It's 100% your fault. "
It's technically still 100% your fault.
You know you're behind in exp.
You should know around when Zed is hitting 6.
Choosing to stay and fight Zed instead of backing off and respecting the level advantage is a lack in good decision making on your part and your part alone.
You can't control your teammates, you can only control you.
Better to lose a bit of CS and live than lose all the CS, exp, and put Zed further ahead by dying.
But I do agree, yeah, your jungler shouldn't be putting you behind like that, that's just a dick move.