Class is an entirely useless metric for analysis, here let me show you by doing class analysis and getting mad because there's some nuanced edge cases to it

Basically everything that Marx writes about capitalists is based on belief that there exists collective class interest.

Any CEO worth their salt will just fuck over their competitors if given chance, not act for good of capitalist class.

Whole idea of "reserve army of labor" is based on belief that capitalists will act to their own detriment for good of other capitalists.

this person has never heard of the prisoners dilemna

Regarding the first point, what does this person think the purpose of the bourgeois state is? Yes capitalists each have their own individual interests and compete with each other, but the state arbitrates those conflicts and maintains bourgeois dominance over society by enforcing the private property relations which benefit capitalists collectively to the detriment of everybody else.

CEOs do fuck each other over, but it is unheard of for them to do this by, say, causing their competitor's employees to unionize. There are real and bitter rivalries in the bourgeoisie, but that does not mean they don't know who the real enemies are.