I think it’s more correct to say dialectical materialism is a subset of materialist philosophy. It’s not a dualist philosophy because the mental realm is not conceived of as a separate thing
This line of thinking indicates the assumption that the only type of idealism is the sort that posits that only matter and 'mental' non-material stuff exists. There are other types, including ones that do not consider said 'mental' stuff to exist.
I myself, for example, fall under the camp of considering non-material non-mental stuff to exist, in addition to mental stuff. I consider some, but not all, of the former to have no dependencies on material stuff, with material stuff being dependent on such, and that all mental stuff depends on material stuff. I am yet to find any sort of conflicts with Marxism on these grounds (or in general, sans, perhaps, some wording that is used by Marx or other people).
This line of thinking indicates the assumption that the only type of idealism is the sort that posits that only matter and 'mental' non-material stuff exists. There are other types, including ones that do not consider said 'mental' stuff to exist.
I myself, for example, fall under the camp of considering non-material non-mental stuff to exist, in addition to mental stuff. I consider some, but not all, of the former to have no dependencies on material stuff, with material stuff being dependent on such, and that all mental stuff depends on material stuff. I am yet to find any sort of conflicts with Marxism on these grounds (or in general, sans, perhaps, some wording that is used by Marx or other people).