I actually think Aarti isn't insecure but the problem is that she unfortunately gets involved in others fights and then ends up at the receiving end of dislike from housemates. The advice she gave Shefali B to play for herself, I hope Aarti only plays for herself. But by nature Aarti isn't a bad person. She tries to be supportive and helpful but sometimes her approach is wrong.
I know Arti can be wrong just like any other average human being but I always feel she has no ego and values her relationships more than anything. She could be doing wrong things but I feel her intentions are never wrong. Her heart's in the right place.. she is not one of those people who enjoys to make/watch others suffer.