One of the ugliest things I have ever had to experience was someone who I thought was a friend showing me and others no compassion during a time of need but insisting others must care for her when she didn't ever show the same care. Shame on her. And if she only knew how much compassion I showed her instead of being heartless.
Anxiety doesn't always begin "naturally". Sometimes it is the end result of years of abuse, whether it's mental/emotional or physical. Be gentle with people that have anxiety issues, you never know what their story is.