1. of course i agree harassing is just dumb, and if someone don't like your translation, they can just find another one, but
2. you cant fight fire with fire. all your 'defense' is fine, right until you insulted people with "pea brain". you're just inviting another fight.
3. "if you cant understand something in the chapter, it's not the translator fault" is an extremely arrogant thing to say. what if it is a bad translation (not saying yours is, i understand everything fine). again, i agree with your 'defense' up until this part.
you're sharing your work with thousands of people, you're bound to get hate out of nowhere. I'm not saying you can't defend yourself, but you can't attack back, hoping the issue will get solved.