there is a button at the top of the website to switch the font

Which is a good sign that the font shouldn't have been used in the first place.

Infuriating is a bit of a stretch. A mild annoyance at most.

I think it can be actually infuriating for some people. I recently discovered that when some friends say that something disgusts them, they are actually feeling nauseous and could possibly throw up. On the other hand, I've never felt nauseaous from being disgusted by something. Same thing about second hand embarrassment, it's annoying for me but I can keep watching something, while they have to pause to "recover". People feel things in various ways, sometimes totally different from how you feel something.