Some people are like that, saying online security is a hoax/scam/joke.
Those same type of people ride motorcycles with no helmet.
What is irritating about this is, if someone wants to take a risk themselves, that is ok. But dragging someone else onto a motorcycle with no helmet is plain irresponsible and self-centered. I say to you now, install ANY anti-virus on you PC, at least. Avast! is free and there if you want it, but good lord, get SOMETHING. Outside of your own sphere, you are also possibly spreading malware to other peoples PC, by not protecting yourself, much like not getting yourself vaccinated.
If you really dont want to deal with the online threat problems, there are always alternatives to Windows as a whole, like a Linux OS, very little malware for now,
so less need for security.