Why would a singer know what Microsoft Excel is? And how exactly is her response even "pride[ful]" ignorance? She just said she doesn't know what it is and therefore doesn't care about the memes. Which part here is pride in her ignorance of software mostly used in the accounting profession?
I'm not going to say she's a genius, but it's grounded for a person to acknowledge when they don't know what something is and don't give a shit. This thing was an afterthought to a music video for a song she was in. The video is tangential to her actual work. Why should she care? If you're going to call her ignorant and stupid for it, you should be able to explain why she should care about Microsoft Excel specifically when it's presented to her in a flurry of internet memes.
Also, why is she on TV? Because she's the second most famous person who was in Destiny's Child, behind Beyonce. Is TV only supposed to show people of high intelligence? Are "stupid" people actually subhumans who should not be represented on television, the bastion of idiots? Are stupid people actually morally bad and smart people are morally good? I'm so confused about all the things your worldview could imply. It's nonsense.