At both the gyms where I’ve had memberships, I never heard anybody mack a person for being new, and if there’s judging going on — which of course there is, there always is, it’s part of the human condition — it’s all done quietly inside people’s own heads.
Mainly, the thing that identifies a new person is that they never put anything away after using it. And push plates off the ends of bars onto the floor and then leave them there, instead of putting them on the storage pins, because everybody knows nothing says “gym” like a lot of matte black plates on the matte black rubber matted floor. Fitness and trip hazards go hand in hand like protein shakes and horrible, horrible flavoring.