with donkey's what?
I'm poking fun at your grammatical error there.
How do you deal with them? By thanking the sweet poker Gods for them. You want to encourage that kind of behavior, otherwise how would the competent players make any money? They might actually have to work for it playing against other competent players!
You mean to tell me, given that scenario 1000 different ways you'd rather have the donkey lay that hand down? You and I both know that, in the long run, playing against players like that is going to net you a ton of money. Trying to "fix" the donkey will do one of three things, none of which are helpful to you:
1. Irritate the donkey, causing him (and his money) to leave.
2. Wise the donkey up, encourage him to learn how to play, and thus make him harder to beat next time around.
3. Absolutely nothing (except maybe get you steamed).
Nothing positive will come out of berating or schooling him. As tough as it might be for your ego, the BEST thing you can do after a hand like is say two simple words:
Encourage that kind of play. It helps calm you down and it encourages him to make plays that will overall be profitable to you. Remember, poker is not about just one hand. It's how you do over months. Think about what will help you more in the long run when you catch a bad beat from a donkey.