MRSA is particularly scary. It used to be considered only a nosocomial infection (meaning cases, while serious, only really occurred in hospitals). Now MRSA is out there folks, in gyms and on playgrounds. While community-contracted MRSA is still not that common, it is very, very resistant to antibiotics.

I would also point out that sometimes an antibiotic really is the most appropriate treatment, and people shouldn't be too quick to refuse it if it is prescribed.

That said, NOT TAKING THEM CORRECTLY is a big problem that also leads to increased antibacterial resistance. If you skip doses, or don't take the full course, you risk the infection adapting and developing resistance.