Has anyone experienced something like this?

Two male contracters came into work tosay, came up to me and I asked them who they were here to see/what they were here to do.

One of them mumbled at me incoherently.

I asked him to repeat what he said, mumbled incoherently again.

Male co worker comes up, and asks what he needs. Guy demeanour changed instantly, spoke clearly to my male co worker and then introduced himself and shook his hand.

You just know they are both calling me dumb or stupid.