In view of the various deaths from online bullying it appears that kids (and maybe a few adults) need to be educated on dealing with idiots.
Someone who tries to bully you online is an idiot.
Someone who can’t respond to something you say online without recourse to personal abuse is an idiot.
Someone who down thumbs or otherwise denigrates something you say online without offering any sort of constructive explanation is an idiot.
Someone who, on the basis of no relation with you apart from an online one, tries to act like they “expected better of you” is an idiot.
Someone who spends untold amounts of time trying to wind you up online is an idiot.
Do you care what idiots think of you? Should that make you change your behaviour or react? No. Of course not. Ignore the idiots.