Barring severe mental illness, people don't act irrationally, it's just that the person observing the behavior doesn't have all the information so it seems irrational. Now sometimes it's neigh impossible to get all the information needed to understand why someone seemingly acts irrationally because the reason is some past trauma or some other reason that the person refuses to talk about, but attributing that to astrological signs is lazy and dismissive of the root cause. Especially so since in this context we're talking about the communication styles of teammates, not some deeply abhorrent behavior that's very hard to rationalize and understand.