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It might be that their lives were hard and that not all of their hopes had been fulfilled; but they were conscious that they were not as other animals. If they went hungry, it was not from feeding tyrannical human beings; if they worked hard, at least they worked for themselves. No creature among them went upon two legs. No creature called any other creature "Master." All animals were equal. (10.7)
If this were actually true, it would be—well, fine. Maybe not ideal, but fine. The problem is, it's not true. The animals proud of an illusion: the illusion of autonomy. In fact, they're just as enslaved as they were before. (Shhh, don't tell Napoleon we know. He might sic the dogs on us.)
There was enthusiastic cheering and stamping of feet. Napoleon was so gratified that he left his place and came round the table to clink his mug against Mr. Pilkington's before emptying it. (10.28)
"Gratified" is just a fancy word for pride. Napoleon is proud of the fact that these human farmers are accepting him as one of their own. Unfortunately, "one of their own" means that he's a conniving, tyrannical overlord. So, you know, good luck with that.