Why are bench research labs often such toxic work environments?

There are countless posts here about PI's, postdocs, and grad students abusing, manipulating, or otherwise having aggressive/inappropriate behavior towards pre meds and/or others below them. I've had this experience myself. I was in a colon cancer bench research lab and my PI once had a full on screaming match with the senior postdoc. There were their actual words: PI: I want you to collect the cells in the afternoon Post-Doc: Tell *Insert my Name* to do it PI: He's got a midterm today he... Why are bench research labs often such toxic work environments?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums