A cult is where people mindlessly follow some sort of doctrine, or leader.
I would think many on the right fit that definition.
From my perspective, it would seem to me that most of the world is in a cult called society. One of the hallmarks of a cult is that the leadership is always right and no one else in the world has the right answer, and members are strongly discouraged from getting outside information. They will have to be disciplined and perhaps shamed before their peers if they begin to question the leadership, and may experience shunning or suffer banishment if they begin to believe the wrong thing. That has been mine experience in this world, so to me, anyone who isn’t examining everything they see and hear critically, and gravitates toward confirmation bias, is in a cult, regardless of what they call themselves.