To improve accessibility and inclusion in postsecondary STEM education, we propose implementing Universal Design for Learning (UDL) based practices to meet the needs of a variety of learners. The UDL is a design framework aimed at improving and optimizing teaching and learning for all people, regardless of their disability status. As part of a larger professional development project, interviews were conducted with members of a faculty learning community to discuss their instructional practices and to offer feedback regarding opportunities to remove barriers to access and participation. In this paper, we focus on an interview with a physics instructor and examine their beliefs about students with disabilities as evidenced by the disability-specific language used in the interview. This prompted a new perspective on professional development regarding accommodating students with disabilities that focuses on confronting ablest beliefs as a crucial component in promoting inclusion in STEM education.