Honestly, I've been with people who needs to undergo anger management seminar (if there is)  . They are easily angered with anything, from a simple erasure or wrongly placed items in their tables. Probably they are a bit tired or stressed.

So, with regards to your question OP, you can just ignore them. Patience is virtue, think of it, and you need a lot of it if you are working with them and with a company that don't have time to look at the situation of their workers. Most of the time there is an overload of work, too much for each worker.