You shouldn't wear socks in bouldering shoes except for the rental shoes at the gym. Bouldering shoes are soft and meant to be worn tight to get the most sensitivity out of the shoe. If you wear socks in them, you demolish that sensitivity by pushing a thick layer of fabric in between your feet and the shoe.
Wearing socks in beginner shoes is fine but it is advised to step away from this once you start sizing down your shoes to get more feel.