[sjs382]

This. A million times, this.

You aren't aware of what they have going on, who in management they have discussed his with, nor what accommodations have been made for them via management. And they shouldn't have to discuss it with you unless they choose to.

If it's affecting your ability to work (beyond the action itself making you cranky and anxious), then bring it up to your supervisor, and make sure it gets followed up on.