That’s true only if judgmentalness is the only source of peer pressure.
If, for example, being successful allows one to successfully exert peer pressure and rational people are more successful, then even if the more rational people in a group are less judgmental they might still exert significant peer pressure.
If the more rational people in a group are the least judgmental, the only source of peer pressure will be from the less rational people.
That’s true only if judgmentalness is the only source of peer pressure.
If, for example, being successful allows one to successfully exert peer pressure and rational people are more successful, then even if the more rational people in a group are less judgmental they might still exert significant peer pressure.