Picking on me

I've just been talking to a contractor at work. Whilst I was answering the question he posed, he began picking his nose. I paused briefly, then he started delving and as I became speechless, he instigated an excavation. He finished, then carried on the conversation as if nothing was awry. I'm not sure if he found what he was looking for, or what he did with it if he did, I just hot tailed and fled. I'm going to avoid that dirty beggar in future. I get enough of that kind of stuff at home.