Also same logic can be applied to any minority who is not in power.
I can’t be in room with black, trans-gender, gay, immigrants etc.
So as result the only people who you built relationships are white straight dudes which get promoted.
No, not really. There are basically zero (published) incidents where, for example, a black guy claims somebody else insulted him when they were alone. For trans women (not f2m, as far as I know), it gets dicey as well.
And you're certainly right: you'll treat them differently, which may be unfair to them, but risk you career to treat them fairly? I doubt that a lot of people will choose fairness to others over their future.
They must make sure that everyone performs to the max of their ability and at the same time limit risks.
Otherwise it is work discrimination light.
The Toledo plant sounds very different from that, with "whites only" signs and nooses (and management tolerating it). The men who are not mentoring women for the reasons stated in the article certainly don't openly insult and harass them, because that would end their careers much, much quicker than mentoring them and being falsely accused of inappropriate behavior.
Exactly, that's all I said. The he-said-she-said isn't enough to have severe consequences, hence few people are uncomfortable to meet 1:1 with a minority.