Irritation due to breathing noises in dojo

This might seem a silly question, but unfortunately I am extremely oversensitive to human noises. I don't mind meditation with the noise of traffic, or a thunderstorm, or the monotonous drone of a ventilator. But when I am trying to do za-zen in a dojo with other people and I hear other people breathing loudly through their noses, it drives me nuts and puts me in an extremely bad mood. Basically, I stop the meditation and just start thinking about my work or something, to stop noticing the noise. I know this is wrong, and somehow I should make the noise, the other person's breathing and my own irritation part of the meditation: observe my irritation and meanwhile keep getting back to my own respiration, but I wonder whether there is some advice, some trick, to make this easier. I know I am my own biggest enemy here, but it's a problem that keeps on occurring and it's hard for me to get out of this trap.