Marxism is literally just an ideological framework which is used to interpret, analyse and critique the socioeconomic conditions we live under. Discussion and implementation of socialism necessarily implies the application of marxism. What you wrote is a bit like saying that women’s rights advocacy is good but feminism is bad.
Do you frequently have full debates with yourself so that you have a hundred percent control over the replies, and therefore always win? Is that productive in your mind?
Ha! I suppose that means you were being honest without yourself and considering new information as you worked your way through it. That’s the heart of the scientific method, and the core principle behind Rubber Duck Debugging.