It means they are being violent and creating conflict.

In this context, conflict refers to the presence of more than One.

Where there is more than One, friction is always present, no matter how subtle.

Declaring oneself spiritual is violent in the sense that when you identify yourself as something different from the other, you create separation.

Separation breeds violence through disharmony and disunity.

A truly spiritual person is not concerned with identity but is fixated on the removal of conflict within themselves that seeks to separate them from the whole.

What people think their words mean and what they actually mean are two different things.

Spirituality may be happening, but that does not mean “I” am spiritual.