Sinning

I think that a lot of Christians are huge hypocrites when it comes to sinning... In the bible it states that all sin is equal, but they treat it like some sins are worse than others, like they get to pick and choose what to judge people for. Especially with being gay. They act like being gay is the biggest sin, even though it's just like any other sin. Plus, they say that all humans sin, so why are some sins worse than other ones when it says that they're all equal? Why do some humans think that they get to choose what is wrong in the eye of God? 
DISCLAIMER: when I say "they" or "people" I am ONLY referring to the ones that do that, and in no way am I bashing on Christianity or saying that all of them act this way.