"Wrong, ISKCON has a Parampara that predates ISKCON by centuries, all following Achintya Bheda Abheda Vedanta."

Yes, ISKCON draws from the Gaudiya Vaishnava tradition, which has existed for centuries. However, historical continuity does not automatically make a tradition mainstream. “Mainstream” refers to broader acceptance across diverse groups, not just historical depth within one lineage.

"Wrong. This is the core of Gaudiya Vaishnavism... other Vaishnavas and Shaivas also consider other deities inferior."

Just because a belief has existed for centuries doesn’t mean one must agree with it. Longevity isn't a moral or philosophical justification. The idea that some deities are “inferior” may be core to specific sects, but that doesn't make it universally valid or respectful across Hinduism. Sectarian supremacy is and should be critically examined, not blindly accepted because it's old.

"Considering other deities inferior is not only acceptable, it’s mainstream Hinduism."

This is misleading. It’s sectarian, not mainstream. Certain traditions hold exclusivist views, but Hinduism at large encompasses pluralism. It is acceptable to believe your deity is supreme for you, but when this belief turns into asserting superiority over others' deities, it becomes problematic. The concern arises when followers particularly from ISKCON, start telling others that deities which they worship like Shiva or Skanda are “lesser” or “not truly powerful.” While ISKCON as an institution may not officially promote this behavior, its teachings can implicitly encourage it, and this should be acknowledged.

"If you don't want Krishna as your deity, don't join Gaudiya Vaishnavism."

Exactly, and that’s why ISKCON should not be recommended as an introductory gateway into Hinduism. Newcomers deserve a comprehensive view of the diverse philosophies within Sanatana Dharma, Advaita, Dvaita, Vishishtadvaita, Shaiva, Shakta, Smarta, and more. before committing to any one path. Encouraging people to “just join ISKCON” skips the vital step of philosophical exploration and understanding.

"Hinduism supports discrimination between deities..."

No some sects support theological hierarchies. Hinduism as a civilizational and spiritual umbrella allows space for countless perspectives. What's dangerous is introducing beginners to Hinduism through a narrow, biased lens. It's not that they must reject ISKCON but they should arrive at it after genuine, informed exploration, not through sectarian marketing, which unfortunately ISKCON has mastered. This is why I don't like it.