^^ Anu the reason that they pick on you is because you answer them and that is what they are looking for is to engage you in debate and then keep annoying you by constantly answering to incite you.
They always pick one or two that make good posts and many reply to them and that seems to bug them to no end.
It is just plain envy and malicious pleasure to make you feel bad.
Don't take what the spew out seriously because they are actually looking to see if it has bothered you enough and they will keep at it.
They are NOT worth a Second thought.