Replying to I Hate Cops

So the other night I was at a party at a friends house. EVERYONE was drunk and/or stoned. So it was pretty crazy. I walked outside to smoke a cigg and I see a cop drive by the house and stop when he saw me . I then turned around and walked inside, shut and locked the door behind me and told the kid who owns the house and that pigs were outside. We do what everyone does in this type of situation and went downstairs, shut off the lights and sat lol. About 5 minutes later...the cop was "gone" ( but not really, he was just chillen in his car around the corner, but we were all to drunk and stupid to know he didnt leave.) Anyway... we all got the party back on and i drank 2 more beers and right after I drank them....I got a really weird feeling that drinking those beers, was probley a really big mistake. Not even 30 seconds after that...6 cops were pounding on the door. My friend opens the door and this one cop starts telling everyone in the house to walk outside single file. So as I waited for people to walk out the door it was my turn to walk past the row of cops I grabbed my friend that I came with (who was way more drunk then me) and told her that I was behind her and to walk straight or she's fucked. So she is walking out the door and as she steps down the first step....she falls...and completley eats shit...right in front of the cops. I'm standing in the door way like WHAT THE FUCK and the cops all looked at her for like 5 seconds then looked back at me. she gets up and starts walking away. so I tried to be as straight as possible while walking and tried no to look at any of them . One of them grabs my arm and basically breaks it off, pulls me away from everyone else then he moves in...right into my face shines his fuckin flashlight in my eyes and says "have u been drinking?" I said no, and he just stared at me...then says "are you driving?" I say no. and he says " then get the fuck out of my sight." I pulled out of his death grip and turned around and booked it. My other friend who was behind me, hadn't been drinking nearly as much as me and acted in the same manner by just walking by. He gets carded, (18 btw) breath-a-lized lol and gets an MIP. What I would like to know is why the fuck was my friend in front of me let go after her drunken stumble down the stairs, but I was basically harassed and my friend behind me was givin an MIP for doing nothing at all? I'm sure theres worse stories out there dealing w/ parties and cops but this was just fucked up.