Why this Siva dwesha among many vaishnavites please?

The ignorance of the human being is the main reason for such differenciation .the knowledge he has gained by .has developed his ahamkara and by which he pretence to over act by showing this dwesha bava.If he had developed the humble quality "Divine Nature " he will not behave in this manner .So lack of the divine knowledge is the root cause of such behaviers.