This case study demonstrates that user feedback on social media is valuable for informing iterative product design for marginalized populations. Using content analysis, I analyzed 136 posts and comments from the reddit platform of a product (SteadyMouse) designed for people with Parkinson's disease. The analysis revealed four patterns in user feedback that may be useful for product redesign: technological details, embodied experience of the product, usage scenarios, and prioritization. While User Centered Design is often cost-intensive, this study suggests designers can intentionally solicit useful information from users in social media forums by offering a dedicated space on websites where product designers related to these four key topic areas.