Answer: Today this is really rather meaningless, but 2,000 years ago when there were quite a few Kabbalists and groups of people who could acknowledge a certain Kabbalist or not, it was meaningful.
As Baal HaSulam says, for King Solomon to be acknowledged as wise, he had to stand before the Kabbalists of the great Knesset (assembly) because other people could not verify it since they were not on such a high level.
Today, however, when people don’t know about the wisdom of Kabbalah, and moreover, they deride it, people may say that someone is a Kabbalist only according to their judgment, according to who they choose to celebrate, and so it is quite meaningless.
Everything is determined by what the teacher teaches you. If he teaches you not to be connected to him, but to the primary sources and through the group to the Creator so that you will see the meaning only in that, then his teachings are correct.
From KabTV’s “Fundamentals of Kabbalah” 12/2/18