The following study aimed to describe the perception of primary education teachers regarding pupils who are discriminated against on the grounds of low functional performance. In this way, the EPREPADI-1 scale (primary education teachers’ perception of their training and professional practice in relation to pupils with disabilities) was applied with a purposive and non-probabilistic sampling aimed at teachers in the Region of Murcia, obtaining a sample with a confidence level of 95% and a sampling error of 5% (410 participants). Being quantitative descriptive research, an exploratory factor analysis was carried out to determine the existence of seven key factors, of which three were considered, due to their high significance for the objectives of this study, to determine their correlation by means of the Pearson test, as well as the Chi-square test and Cramer’s V test to determine the correlation between the factors and the ordinal variables of the scale. These tests allowed us to analyse the existing relationships between the specific training received (initial and continuous), and the effects that this training had on the performance of their professional practice. At the same time, we investigated the perception teachers have of their use of the language of negation, and to what extent the semantics used can lead to situations of exclusion.