In subjectivism, truth is often seen as a construct, relative and contingent upon the subject's perception, cultural background, and personal beliefs. Truth becomes a fluid concept, varying across different contexts and experiences. On the other hand, objectivism posits that truth is a property of propositions that accurately reflect an external, independent reality. Objectivism tends towards a correspondence theory of truth, where statements are true if they mirror the state of the world. Subjectivism leans towards a coherence theory of truth, where the focus is on the consistency and integration of beliefs within a particular worldview.

Subjectivism posits that knowledge of the external world is always mediated by personal perspective, but this does not necessarily lead to solipsism. To argue against solipsism within a subjectivist framework, one could point to the coherence and consistency of experiences that extend beyond individual sensory data. The capacity for communication and shared understanding suggests that there are commonalities in experience that cannot be solely attributed to one’s individual mind. Furthermore, the practical impossibility of functioning in the world without assuming the existence of other minds and external realities challenges the solipsistic position, even within a subjectivist outlook.

Subjectivism raises questions about the universality of scientific knowledge, suggesting that scientific findings may be influenced by the observer's perspective and potentially shaped by societal, cultural, or personal biases. It may argue for the provisional and context-dependent nature of scientific theories. Objectivism, in contrast, provides the philosophical foundation for the traditional scientific method, asserting that scientific knowledge reveals objective truths about the world. It supports the idea that through rigorous experimentation and observation, science can transcend subjective perspectives and uncover universal laws that apply regardless of individual beliefs or cultural contexts. Thus, objectivism reinforces the pursuit of objective validity in scientific endeavours.

Objectivism maintains that while perspectives and experiences can vary greatly, this diversity does not necessarily affect the objective nature of reality; it simply reflects the complexity of the human condition and the myriad ways individuals interact with the world. Objectivists would argue that the objective reality is constant, but our access to it and our interpretations are influenced by personal, cultural, and contextual factors. This does not undermine the existence of an objective reality but highlights the limitations and variabilities in human perception and cognition. Therefore, objectivism aims to distinguish between the subjective nature of human experience and the objective nature of the world itself.

Subjectivists would argue that commonly shared experiences are a result of similarly structured sensory apparatus and the cognitive faculties humans possess. While these experiences might appear to be objective, from a subjectivist standpoint, they are the converging of similar subjective perceptions. The subjectivist view allows for intersubjective agreement, where individuals can reach a consensus about experiences, not because they access an objective reality, but because their subjective realities are sufficiently alike due to shared human conditions and cultural norms. This collective subjectivity forms the basis of our social reality, enabling communication and social interaction despite the fundamental subjectivity of individual experiences.