Open 'phones are often a bad idea in that type of environment. They let lots of sound in which will usually make you crank the volume and other people will beable to hear what you're listening to.
Personally I find the tish-tish-tish sound that leaks from most open headphones more annoying than if the person was just using speakers. I wouldn't use them unless the environment was fairly quiet and there wasn't anyone nearby who would complain about the leakage.
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