This is not the fault of the hire company's,it is a society problem,you will get noisy and annoying groups of people whatever holiday you book wether it be boating,seaside,hotel,coach trips and even caravan holidays.
These people usually behave, but the root of the problem is ,yes,too much consumption of alcholol,and when they are ,or have been drinking, these people become the hooligan element.
Cheap booze is readily available today in supermarkets etc so it is easy to stock up and drink all day long,hence this is the problem.