Remember that at the library there are other researchers. Be considerate of them. I’m fairly patient, but here are a few things that have given me cause for frustration lately:
A gentleman having a cell phone conversation in the library about going fishing. He was yelling into his phone. It was all I could do to concentrate.
Two researchers lamenting the destruction of tombstones in an Alabama town. While I understood his frustration, his twenty minute diatribe about the injustice of it all was highly distracting. I was at the library to actually do research. They could have easily taken their conversation to another area.
Be considerate of your fellow researchers. You may one day be at the library trying to read illegible script when someone sitting next to you is carrying on very loudly about the latest injustice your son-in-law has inflicted on your daughter. While it does sound like he’s a lout, the discussion can be had elsewhere.