Everyone has "haters" online. It goes gand in hand with being liked. The more you are liked the more haters you will have. It is fine if people want to put so much energy into negativity.
As for telling you there are people who hate you, they are playing mind games with you. They are trying to play on your insecurities.
There is an analogy i have used with my children that really helps when kids are mean to them and i think it works here too. Every person builds a safe wall around them of well being, safety, security. When someone does not have all their bricks, they may try and shortcut it by stealing a brick from someone else....this is what this person is doing. They are stealing your sense of security.
