Fact: undead skeletons in Dungeons & Dragons
Edition are sapient (Intelligence 6, Wisdom 8), aligned (Lawful Evil), and understand the languages they knew in life.
Conclusion: you can argue with a skeleton.
Skeletons being sapient beings instead of basically automatons makes using them as labor in undead polities way less ethical.
if you can argue with a skeleton, you can debate with one, which means one can run for office and they can organize unions to fight poor working conditions!
Skeletons and zombies can rise up and overthrow the lich and vampire aristocracy! You have nothing to lose. Like what are they going to do, make you - double- dead?