.It is better to simply ignore them and if they try to confront you about it you just tell them that is none of their business, in my experience this will irritate them to the extreme and will demonstrate to anyone who cares about watching this that they were just looking for a fight with you and then they will ignore anything they said about you.
The more you ignore them the more you would become vulnerable to their hate. It is better to find their weakness and then downgrade them infront of everyone. In today's time everyone has some kind of addiction. You can use that as a weapon to defend yourself rather ignoring them. No one is a saint in these times.