I don't see a problem doing both. If you believe in a charity and can afford to give, you should. And you certainly can then encourage others to follow suit. This applies to celebrities too.

But this meme is describing celebrities asking others to give for a cause they aren't supporting themselves, despite having much more money to spare. They probably view it more as just another job, but if they are doing more than just performing and are actively soliciting donations then that is hypocrisy.