Things you're talking about are not exclusive to people working in entertainment industry. People put on their best fake every day, some of your close friends lie (exaggerate) too. We all do it to look better, especially in front of people we don't know. You also have to remember that celebrities (esp. women) have to put up extra shield because of the creepiness that surrounds them, on internet and in their real lives. You can't fault them for putting on the "mask". Best you can do is not buy into every PR served BS celebrities say and not take it too personal. Don't have to be negative about everything but also don't take their words as gospel.
And in case if you to ever truly get to know them, well, in that case, if the friendship is real and they think you are with them because who they are not who they project to be, then those masks should fall off. Right?