Next time I talk to a girl at a party, I'm gonna ask to see her browser history "because it's a good test for red flags." Judging someone by what they watch or read is stupid. Judging someone by what YT thinks they would like to watch is even worse. I know this is completely besides the point, and it is just a meme, but judgy behavior like that irks me.
I think the question is rather forward for a girl you just met at a party, but at the same time I think someone's youtube recommendations would be a good indicator of some obvious red flags that someone may want to consciously hide from a prospective partner. For example, if someone's feed is full of alt right/joe rogan/incel crap, or for women, full of FDS crap, you're damn right I'm gonna judge.
I can definitely see the point if it's literally all there is in the feed, but if you just watch things from people you disagree with from time to time, and the algorithm picks up on it, there's bound to be a few things in your feed that might "look bad" if they are used to draw conclusions about your worldview from someone who doesn't know you.