A rationalist is not synonymous with the traditional definition of rationality. The two are often confused, but rationalists are actually empiricists. They are rational in the game theoretic and economic sense. The primary difference between rationalism and rationality is that rationalists use sensory information as the criteria for truth whereas rationalism uses reason itself.
Someone who practices this brand of rationalism within the movement may describe themselves as an 'aspiring rationalist' rather than straight-out 'rationalist'