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Tell them directly I don't give a shit, or that is your problem. Stay firm and you will either grow to deal with this shit with ease or they won't bother you anymore because you aren't giving them the satisfaction of responding to that bullshit.
Easiest way to deal with any scum is to ignore them. Every human is little bit troll inside and they feed of your anger or affection. Only way to ensure that you wont be bothered any more is by not giving a fuck.
Good luck anon!