There's still plenty of crappy headphones, as others have pointed out, but consider also listening from a phone's speaker, a cheap bluetooth speaker, with just one earbud/headphone on, etc.
Speaking of, I think the sound quality of modern-day bluetooth speakers is really good.
> I think the sound quality of modern-day bluetooth speakers is really good.
The sound quality out of the speakers of some Apple products seems borderline impossible to me. The MacBook in particular makes me feel like I missed an important DSP lecture at university.