It turns out that just being in meetings and group situations can drain your brain. In a study done by researchers who probably wished they were working alone, they found that when people are made to work together in small groups, their brains start freezing on them like an old computer running Windows Vista. There are a couple of reason for this; one, they have to focus more on interaction and behavior (think of all the brainpower that goes into not scratching your ass in front of others) instead of the task at hand, and two, because their status within the group is affecting their performance. Confidence matters, and it's hard to keep it up when you're working around assholes.
So, the more competitive the group is, the dumber some of its members will become. For the study, people with similar IQs were put into groups of five and ranked for their performance on mental tests. When the results were shown to the entire group, those who came out last started performing significantly worse for the next tests: They felt dumb compared to the rest, so they screwed up more than they would if they were working alone. The researchers believe that the same thing happens in more subtle ways in everyday life. Some people simply function better on their own.
"Can't we just handle this separately and talk about it later? I have work to do."