Im not a fucking child!!!

Ok so i have this one friend who is really starting to get on my nerves. Every time i do something that she thinks is wrong she is immediately on my case and starts talking down to me as if I'm fucking five years old!! And people have had the nerve to get up me for it yet its as if no one else sees her do it but me!! She is really pushing me to a point where I'm going to snap at her. But that will only make me the bad guy cause i know she will cry as soon as i do. Talk about stuck between a rock and a hard place..... I have two options but I'm not sure how that is gonna go down with either one that i pick. Either way shit is gonna start.