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DHTiling
I can't understand why you are angry. Work is work isn't it. If you are busy enough to turn it down do so. If not then do the job. You lost the floor ... So what. Did he ow you the work, did he give you the order then renege, did he give you any indication that he wanted you to do the floor... It doesn't appear so from your op and if he did I could understand your frustration. The other tiler cant do part of the job, you can... If the other gu could doit he would have and you wouldn't get anything at all out of it, at least this way you get some work and some wages...
If you were a tiler then you would be... yes work is work but it is also a builder taking the pi$$ .. simples as that..