That's fine, but it really is a very low percentage. I find the WDW crowd which is mostly tourists to be more entitled generally speaking and behave much worse than those at DLR. The majority of DLR AP holders have a great love for the park and treat it with a ton of respect.
The staking out of spots happens at every park, including Tokyo where they have rules against it. I've seen hundreds of people in Tokyo running at rope drop to stake out places for a show that won't begin for 5 hours. This is not an AP problem, it is a Disney parks are crowded problem.