I do not deny the existence of mind. What I object to is characterization of material as having limited properties. We have no way to know the limits of material existence -- so the use of "materialism" and "materialst" as pejoratives is simply ignorant.
But I protest!!! Ever since James Clerk Maxwell, and through DeBroglie, the classical idea of matter has had to be "substantially" modified. If (as you say) I am using the terms "materialist" and "materialism" with perjorative intent it is only because, historically at least, these terms have referred to people and theories that are driven by the idea of "matter," not only in its classical sense, but also in its sense of being the "real" polar opposite of a fictitious "something" that does not/cannot exist: that is, the soul (psyche, that complex of consciousness, mind, will).
I don't think my use of the term in the context I gave was/is "ignorant."