It is not okay to pretend ignorance. I know it is the easiest route in a life of hardships, but that route will take you to places you wanted to advoid in the first place. So if you know that someone isn't being honest why should you sit there and take it? Why not actually find out the truth? why should you make that lie even bigger than it originally was. That is what you do when you allow people to tell you anything they feel the need to. I'm not saying that nobody is trust worthy, and i am not saying that you should be suspicious of everyone. I am saying that certain people can only tell the absolute truth so many times. This way you advoid drama and are not so susprised when it's not the truth that comes from their mouths. You must remember that not everybody lives by your values.
Truth- I think finding the truth is easier than listening to lies.