The one that got me was the comment about a customer looking past her at a co-worker, even though she was older than he was, and "for all they know, more experienced". But, she's not actually more experienced, she's new at the job, which might have been evident (this detail is left out). Anyway, judging someone's competence based on their age, which she expected them to do, is hardly better than doing it based on their sex.

If the customer was trying to guess which of two people in front of them might be a welder, and only 5% of welders are female, it's not irrational to assume that it's the man. The customer may never have seen a female welder before. Until they say something like you can't be a welder, you're a woman, I think the generous reading would be that the customer is having their priors updated in real time, not necessarily that they're a misogynist.