You explain to the snowperson they don't exist. Or rather, that they already exist as each individual snowflake, and the idea of a snowperson is a construct they're voluntarily choosing to collaborate in. Therefore there are no contradictions at all, just different terms for different levels of voluntary association between consenting snowindividuals. The snowflakes breathe a sigh of relief and, instead of finishing the second snowperson, they make a plea to the snowflakes in the area to create a voluntary association in the shapes of other snowpeople. Soon, you got yourself an entire group of voluntarily associating snowpeople, and as a thank you, they throw you a little party and concert. They might not be the Red, Her Rings band you were going to see, but they sure played some good coldwave.