Nowadays, some of HH the Dalai Lama's followers have their own special pride. They claim that HH the Dalai Lama is so superior that they themselves should be considered superior.
HH the Dalai Lama, it is true, is very great, but it does not necessarily follow that one who claims to be among His followers is also great. The greatness of a master depends upon his realization. Blind allegiance to a master cannot make a practitioner superior.
It is common for them to look down on the practitioners of Dorje Shugden, thinking of them
as ignorant practitioners whose practice is not supported by right understanding of the Dharma's true meaning.
Some of them claim that the Dorje Shugden practitioners don't belong anymore to their Gelugpa tradition. Others, go as far as claiming that the Dorje Shugden practitioners are not to be considered as Dharma followers.
These are attitudes commonly found among Tibetan Buddhist monks and lay people.
They may be common attitudes, but they are not Buddhist attitudes.
One who despises another Buddhist school despises the Buddha. He impairs the transmission of the Dharma. The presence of the Dharma is jeopardized by such an attitude, and one becomes cut off from its transmission. This is so because one's refuge vows are based upon reliance on the Enlightened One, His Teachings, and the Holy Community. If one rejects Dharma one breaks one's refuge vow and thereby becomes cut off from the Dharma. By rejecting this Dharma that is the only door to happiness for beings and oneself, one accumulates inexhaustible sin.
Therefore, the Buddha taught that one should also not despise the Dharma of non-Buddhists for it is their source of happiness and benefit. One should not despise or harbour contempt for the doctrines of the Hindus, Christians, or other non-Buddhist religions because this attitude of attachment to one's own side while rejecting the possibility of differences is harmful to one's own spiritual career.
Those people who harbour voiced or unvoiced contempt for the teachings and the lineage of other schools incur great sin and terrible consequences. Worst of all, this attitude is as unnecessary as it is harmful.
One whose Dharma career is tainted by narrow-mindedness and attachment to one's own interests while rejecting those of others will never overcome the many obstacles to the attainment of wisdom or insight.
Sectarianism turns the pure Dharma into poison. Through it, one accumulates great sin. In this life one will be frustrated in one's own Dharma efforts. Upon death, one will fall into hell as swiftly as an arrow shot from a bow. These are the consequences of spending a lifetime in rejecting others' spiritual efforts on such narrow-minded grounds.
Therefore be mindful not to indulge in this attitude that brings so much unsought harm upon yourself. Do not create obstacles to your own Dharma. Strive instead for pure faith and maintain that faith in all manifestations of the Three Jewels, no matter whether they are represented in one school of Tibetan Buddhism or in another. Painstakingly nurture your refuge vows and pure faith and thereby grow truly in the Dharma.