It's rather easy if there's a lot of seats filled and the CG is far enough aft. High gross weight means high AOA to compensate, and a sufficiently aft CG means it's easy to get into a nose high attitude on roundout. I was along for a ride once when a guy did a tailstrike in a 172, had to put another tie down ring back there. The rings are not as cheap as they look. I would say flatspotting the tires is more egregious than gentle tailscrapes because side loads will eventually buckle the suspension, leading to serious ground contact and a prop strike.