It's just not consistent since other parts of the page are in sans serif. I just prefer sans serif, I guess. Serif fonts remind me of cursive. Sans serif fonts seem more objective. For example, when you write "dog" you don't necessarily want the word to look like a dog.
Nearly all available evidence suggests that whether the font has serifs or not makes no difference with respect to readability on the screen.
That you think of sans-serif as more objective is actually quite funny. Newspapers, books and magazines β i.e. pretty much everything we read until a few years ago β used nearly exclusively a serif font for all their body text. Now itβs serif that sticks out.
