Endermite in Peaceful?!

So i was testing out ender mites and it glitched and is not dying with /kill @e[type=Endermite] OR switching to peaceful
Steps to Reproduce:
1. Take a spawn endermite egg
2. spawn in endermite
3. /kill @e[type=Endermite]
4.Repeat until endermite doesn't die
5.then switch to peaceful
6.endermite will be spinning around like mad and wont die
P.S. sorry for the horrible marking