Jungles stealing exp mid. Your opinions

Honestly, as a mage it just pisses me off that some junglers have the audacity to steal exp at mid. I get lvl2 latter than the other mage and can't rotate as quickly. I don't know which tutorial they watched but recently I've just encountered a lot more players who don't buy the jungle blade first, get the first wave and then go jungling. As a solution to that I just steal back the exp from the blue buff, and then they get really mad because I'm "stealing their exp".

What do you guys think about this?