Why?

So, I show up for a substitute gig this morning. Only to find I'm not needed. And not only not needed, but seemingly warned off by a very aggressive, territorial person. Personally, I think 8:15 a.m. is a bit early to be getting all up in someone's face, but that's just me. What's up with that? I'm not trying to taking money out of your pocket or food off your table. There was simply a misunderstanding, and a pretty innocuous one at that. And, yes, I am needed this afternoon - by which time, I hope that particular person has gone off to lick their wounds, or whatever. Sheesh!