Co-Worker and Silent Treatment

Last week two coworkers and I had to come up with an event at work. I felt like the two coworkers were ganging up on me. I was trying to work through the challenge when I finally asked them give me enough space to work through one part of the issue. I continued to try and get their feedback but they both shut down because I was not doing exactly what they wanted. One of the lady coworkers then began to give me the silent treatments at work. At first, I did not realize and continued to work out the event for work, until finally I asked her if everything was ok. She said yes and then continued to ignore me. Finally, I apologized and asked her if I did something wrong. She said I snapped at her and I really did not feel like I did so but they were both down my throat. Ignoring someone is so disrespectful. Who was at fault?