It's not both. Either the taxi driver went through the process of being hired as HR personnel for the corporation, or else they didn't.

> what do you mean when you say "Maybe the powerless person is a homophobe" ?

The taxi driver may cause conflict with gay passengers. Or female passengers, or whatever else. Then they would blame their own victim for their reaction. The taxi driver's personal biases and animosities would become a vector for corporate discrimination.

There is a reason that corporate bureaucracies take such care to look out for this kind of thing. If you let ordinary people just go with their gut on things, you end up excluding a lot of people based on stereotypes and bias. It's not some theoretical possibility, but empirical fact.