Referring to the results of the authors’ own research published in The New Educational Review (Turska, Bernacka 2010; Turska 2011), this article attempts at competitive verification of a hypothesis that explains differences in the perception of a mathematics teacher by Polish male and female students in view of a popular stereotype that Mathematics is a domain for males. It was assumed that diverse perceptions may result from different interpersonal expectations of the two genders. A comparative study carried out on a group of Ukrainians, established in accordance with the principles of ecological validity, seems to further substantiate the stigmatising effect of the stereotype in Poland.