The aim of this article is to present and to analyse briefly the issue of homophobia and heterosexism in Québec schools. This is done by illustrating the author's discourse with an example of a workshop he facilitated in 2009 in a classroom of a cégep located in Québec city. The goal here is to demonstrate that homophobia and heterosexism prevention in schools can be done simply and efficiently. This article stands as an analyse of the scientific litterature as well as a reflection from the author's experience.