If you realized you are a "Dimaagi Naxal" just yesterday, then you are not. You are just swayed by the propaganda of real "Dimaagi Naxals"
I started seeing a trend lately of relatively unassuming folks started identifying as dimaagi naxals just because PM said to be wary of such people. Their argument is that the PM is talking about people who generaally critize the government of the day. Either they did not listen carefully to what PM said or they just bought in the lies of the left propaganda.
To give you the context, India achieved a major victory of eliminating Naxals which is worthy to be celebrated. The problem with Naxalism is not just on the physical battle ground, but the narrative which few malicious people spread to encourage people to take up violence against the sate. We all must be wary of such people whether you call them "intellectuals", "urban naxals or "dimagi naxals". Dimaagi Naxals are not a new phenomenon, its worldwide and every democratic country reserves its right to defend against them.
If you don't encourage violence against the state, which is the will of the people, then you are not a dimaagi Naxal. It's as simple as that.