Since we seem to be laboring over this point, all I can say is this. You are an employee who has only been with a company for a short period of time, in this case one year. You clash with an individual the company has recognized as a top customer and one that potentially encourages others to buy the company's product. The company then has to decide between alienating said customer and the network of people they bring to the table, or dropping you like a hot brick to salvage the relationship.
If this is the scenario, odds are good that the employee is the one that gets the axe, regardless of age, race, gender, or orientation. Companies are there to make a profit and stay in business, and if you threaten that you are the expendable one. Right or wrong, that is the reality of corporate life. Hopefully you land on your feet and don't run into a similar situation with your next employer.
The only way to avoid this is to become your own boss, which is great in the sense that you can no longer be fired. But it also means it is on you to drum up all the business, foster good relationships with customers, and answer all the stupid questions they may ask you. Generally it behooves you to be polite, honest, and relatively patient if you anticipate trying to have repeat business. And I say this as someone who is self employed.