People don't change the default 16px font size in their browser (You wish!)
I am really happy to still read articles that advocate for the use of proportional CSS units as em and rem in 2016. But there are often trolls that come comment these articles to say that we, who are using proportional units, are dumb, because there is no need for this. Here is an example. There are unfortunately two misleading urban legends in most web developers minds. I often call myself a troll, that's not that harsh when I'm the one saying it… 😉