We argue that defensive interpretations (accept positive effects, discard negative effects) of social comparisons are constrained by reality, that is by perceived other-self similarity. Whereas moderately similar others may yield defensive contrast effects on self-evaluations, non-defensive contrast effects occur when other-self similarity is high and the relevance of the social comparisons is thus undisputed. Furthermore, we demonstrate that, whereas the self-evaluative impact of moderately dissimilar others is null, extremely dissimilar others yield assimilation. The findings support the interpretation-comparison perspective on social comparison processes and effects.