People seem to sense when you haven't been on a bike for a while, notice your unsteadiness, and then choose that moment to lash out. Such cowardly creatures, humans can be, when they see someone they think they can push around without any chance of themselves being harmed.
In her defense though, she probably feels a lot like I do when I see people out in the road walking, jogging, or like this guy, in a power chair, WHEN THERE'S A PERFECTLY GOOD SIDEWALK A FOOT AWAY.