Which logical fallacy is used in the text?
Mr. Livingston argues that we need to do more to prevent workplace injuries and fatalities. I doubt that someone so socially awkward would know a thing about office safety.

 - bandwagon fallacy: the assumption that the popular choice is automatically correct
 - ad hominem: a personal attack against one's opponent
The text argues that being socially awkward determines knowledge of workplace safety. This is a personal attack that isn't relevant to Mr. Livingston's desire to prevent workplace injuries. This illustrates a type of logical fallacy known as ad hominem.