It really seems like the author of that article has brought it upon herself because she continues to tolerate it, and does it herself on occasion. The rule is

It really seems like the author of that article has brought it upon herself because she continues to tolerate it, and does it herself on occasion. The rule is wait 15 minutes and then leave. After a couple such incidents, then you flip the flakey bit, and stop agreeing to meet that person one on one such as at restaurants or for day trips. It's still OK invite flakies to parties or group gatherings where it doesn't matter if they show up or not.