The bourgeois (capitalists) are defined by their exploitation of labour

The petty bourgeois are defined by having to work as well as exploiting labour.

The haute bourgeois no longer needs to work because they employ sufficient labour to produce enough surplus for them to live on

Artisans own property but do not employ labour. They do not exploit workers and are therefore not bourgeois.

As property owners, they are not wage labourers and have some stake in the perpetuation of property

But until they employ labour they have no direct conflict of class interests with the working class.

As a class they will waver more than proletarians bc their class interests are still attached to the preservation of property, but less than the petite bourgeois because they have no class interest in exploitation