Nope.
People are, by nature, too egocentric to even notice anything about others 'cept maybe those closest to them.
We may just feel exploited when we're barely managing to hold ourselves more or less upright without screaming, because they act the same as always and our ability to tolerate it is so severely diminished.
Those "energy stealers" mentioned above...sure, they do exist, I just don't think they take more than usual when we're down, we just have a lot less to give, so any loss is much more keenly felt.
Just my .02, of course. :)