Lots of times I hear people say "you have no room to talk," or other such things. But why can't hypocrites give advice? It's advice all the same. And they're still human beings...just slightly bit harsh ones but that's irrelevant!
I think if you're being a hypocrite in the advice you give, people will see your advice as null and void because if you can't walk the walk, don't talk the talk. Personally I don't want someone to advise me to do one thing when they openly do the opposite.
So if I shoot a man, and then turn around and say to you 'Hey, don't shoot people, it's bad' that advice becomes void because I'm 'a hypocrite'? That logic does not compute with me. Obvious hyperbole, but the point still stands.
If I was asking if I should shoot someone, I would not likely go "the person who shot someone said not to, so I wont", I would probably question why if it's so bad to do that, that person did it themselves?
See, that would make sense in certain scenarios, but I think the aim of the thread was more at times when people know the 'hypocrite' is right and are just too stubborn to admit they themselves are wrong, so they play the hypocrite card to change the subject/get around the truth of the matter.