What do you think is the most irritating thing in philosophy?

Philosophy in general is very openminded and encourages discussion and different perspectives. However, there has to be something that really irritated you. Maybe it is something one of your professors or students did, or maybe it is something you heard an other professor say.<br><br>What irritates you the most?<br><br>(Note: Please do not argue with people. This topic is not meant to initiate an argument, but it should be a place where people can talk without being judged for it)