In today's society, there are two scenarios in which the proletariat and the bourgeoisie are linked:
Scenario 1: Buying a product and exchanging money for supplies.
The relationship in this scenario is easy to understand, as long as it is in a mature market environment, the two parties to this behavior are definitely a trade relationship.
Scenario 2: Employment relationship, where workers exchange labor for money.
The relationship between the two individuals is also a trade relationship, not exploitation. Because there is competition for labor between employers, exploitation causes employers to lose their labor. Moreover, there are no natural barriers between employers and employees, and exploitation can divert employees to employers.
But most people think that they have been exploited by capitalists, and this feeling actually stems from the gap between the rich and the poor. There are many reasons for the gap between the rich and the poor, some of which are reasonable and some of which are unreasonable. It should be analysed on a case-by-case basis.