It is called business. The company's ONLY duty is to bring profit to its investors and management is legally bound to maximise it. Now, the definition of profit may differ as well as what is profitable and what is not, but the company is legally obligated to work to bring profit and if you throw a good deal because you don't like it you better explain it to your investors.

Whether you like what your supplier does or does not is of no concern. If couple of units can be detected and written off it is treated as cost and you move on to decide if it is still profitable and whether you can get better deal somewhere else.

You let you emotions rule and it just means you are not fit for the job.