Is OTHER wrong in the post ? POST : I'll provide as much context as I can, but details may be slightly hazy.

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This time of year, as many of you know, is finals week for students across the US, with me being no exception. In 2 hours I will be taking an advanced Calculus final, of which I am woefully underprepared. In an attempt to correct this conundrum, I have spent the past two days in my university library, going over every note and practice problem I could find. My favorite room in the library is the Map Room, way down in the basement. It is relatively unknown and is used by most students because you can typically hear a pin drop from 30 feet away. My potentially asshole-ish moment came after about 10 hours going over Power Series Representation, when two young woman walk into my sanctuary of silence and begin screeching and cackling like old cartoon witches. I gave them the benefit of the doubt, as they were not the only ones talking, as there were lots of study groups having quiet conversations, perhaps they were just a little too excited when coming in? I'm not petty, I'll let it slide. Well after about 20 minutes of what must have been a life changing comedy routine based on the sounds they were making, they decide it fully appropriate to start facetiming their friend (without headphones I might add, I know, the audacity.) Well this does not sit so well with me. Do these ladies not know there are students with finals all around them, and that they're in a LIBRARY? Well being the level headed person that I am, I approached them and decided to speak my mind. What I failed to realize, however, is that because everyone else in the room was as silent as the dead, as soon as I got the attention of the charming harpies sitting across from me I would have the attention of EVERYONE within 50 feet. 

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Without knowing that important detail, I tried to express how rude I thought it was to be so oblivious to your surroundings, and said something along the lines of "Hello, I'm not sure how aware you two are, but there are students with finals trying to study, myself included, are you are being \*incredibly\* loud."

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Well, due to the graveyard like silence that had taken over the room, I had essentially just told these two young woman to shut the f\*ck up in front of about 50 people. I was met with an awkward "Okay..." followed by the most deafening silence I have ever heard. Have you ever heard 50 people all trying not to be the first person to say something? It's pretty funny unless you're the one who caused it. 

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Well to make a long story short, they settled down, but the friends I was studying with laughed and called me a dick for confronting them, but I thought I was well within my rights to tell them to be quiet. So the question is, AITA?