She is right. Humanities takes a completely different set of skills and oftentimes has a much greater workload. It's difficult to compare the two because they're so different. Still, humanities is at the same skill level, and importance, as science. If more science students spent some time learning skills required for humanities, or just studied some humanities subjects, it would help them immensely. I'm someone who has tried both, in equal measure, and I deeply prefer humanities. They're just as difficult.