Handling “abrasive” customers

I’ve noticed something over the last 4 years. Although rare, I have some customers that I swear seem to ‘test’ me on how I’ll respond to their pressure. I’m thick skinned, so usually I keep my business etiquette. However I can only be proverbial ‘walked on’ so much. I’ve found that matching their level of aggressiveness somehow earns me their respect instead of remaining cordial. The few times I’ve done this the outcome has been a much healthier working relationship and I truly believe has lead to more orders. I swear it’s like I earned their respect rather than maintaining ‘the customer is always right’ attitude. Anyone have similar experiences?

What prompted this is I just found another one that’s being condescending to me regularly, so I’m preparing to give it back. lol