On my personal thoughts on a cult or not, every religious movement can basically be labelled as a cult, depending on motivation and context. Since the definition of a cult is a religious movement that focuses of a certain doctrine or philosophy, or a deity figure, no religion is excluded from the identification as a cult. In layman's terms, the word cult is used to describe a religious movement that is perceived as harmful, or has done harm to others in any way, shape or form which is why that word is never used to describe religions. As Dorje Shugden practitioners, we should have seen this coming, we have chosen to accept the discriminations and nasty things that come from detractors of Dorje Shugden, the day we chose to have a Lama that practices Dorje Shugden, so why should we be sensitive about it or even care? It is just part and parcel of being a Dorje Shugden practitioner, it does not mean that the discriminations should happen in the first place, it just means that we have to be prepared for such comments directed at us. Nobody is free from criticism, including the Dalai Lama and the Buddha, so what about us and Dorje Shugden?
Over the years, I have read so many articles about Dorje Shugden, both for and against and I have come to one conclusion: people's opinions on Dorje Shugden does not matter at all, because it is results that matters at the end of the day and secondly, our faith and who we chose to believe in is a very personal matter and if they cannot respect that, too bad for them. All of the articles against Dorje Shugden are based on nothing but opinions and inferences, while the pro Dorje Shugden articles are based on traceable historical accounts and facts. Nothing can shake my faith in Dorje Shugden except for my Guru, because my faith in my Guru is higher than anyone else, and since Dorje Shugden's connection with me was only possible via my Guru, it only makes sense that the only reason for me to give him up (although it would be difficult) would be for him to tell me to give up the practice. I doubt my Guru will ever do that.
What I'm saying is, dont let the detractors get to you, because they're not responsible for your spiritual salvation, you are.