2 things to remember about Nigerians, especially Nigerian women:
1) They don't beat around the bush. Don't be surprised by their direct statements. If you want to faff about when you talk, that's your problem.
2) Uni education, where they're from, is a privilege. For you to not get the grades in the first place that you needed for your preferred career option is inexcusable and shows you're not serious enough about it. It's shocking to a lot of people from African countries that all you had to do was get the grades and, bam, you're in. But you couldn't even do that. So you're wasting your time faffing about.
Not necessarily true of course but it's the way people see it when they see those given a free ride failing.
In South Africa, where I'm from, you needed money to go to uni. I wanted to go to Oxford but didn't get the grades. I still got good grades, but not Oxbridge grades. My grandmother was like "why did your parents even bother to move to England if you're not going to take all your free opportunities?" It's just how they view things. They do have a point though because the only reason people don't get As and only As is laziness.