Don’t think Bruv, you are dangerous enough has it is.
I think Apple products are vastly over priced and extremely well marketed to people with more money than common sense…but hey what do I know ?
I choose to use Open Source software, last time I worried about malware was 10 or more years ago…but hey what do I know ?
(How did you get that errant H into such a short piss take?)
At last, something we agree on!
I think it’s common sense to buy something that is not subject to being attacked by viruses, malware and trojans on a daily basis. But that’s just me. 
But my Windows installation has not been attacked by viruses, malware and trojans (except for a few PUPs) at all, never mind on a daily basis.
And that’s running only Windows Defender, the Windows inbuilt firewall, Malwarebytes Anti-Malware and Malwarebytes Anti-Exploit, all of which are completely free!
Each to their own mate, I have had Windows PC,s in the past, and except for the intrusions and other probs I have liked them for what they did. But I had some spare dosh and needed to either buy a new pc and start all over again etc, so I decided to go for a Mac. A decision I am more than happy with, unlike some. 
My pleasure.
Buy ?
I haven’t bought an operating system for yonks
I aren’t very techno minded, but can anyone suggest the best free malaware please?
Do yours all fall off the backs of lorries, then?
Malwarebytes (Free).
Assuming you meant anti-malware products, of course. Malware is invariably free to anyone who unwittingly downloads it!
JB when you scan, do you have ‘rootkits’ scan on in Malwarebytes?
Not at all…search Linux
To be honest, I’ve never noticed. I just run the scan as normally presented. In fact, I don’t think there are many options in the free version.
Yes, I know. Just my typically British humour.
Most of the supposed threats out there are made up by the companies trying to sell anti virus software. It is nowhere near as dangerous out there as they would have us believe.
You know…and you still pay for an inferior operating system ?
Not so smart then.
The Mac is generally considered to be safe and secure, and there are a number of reasons why Macs are considered more secure than PCs. Malware writers are less likely to target Mac users because of the perception that it has a far smaller market share than Windows. There is also the fact that the Mac operating system is Unix-based, and Unix offers a number of security features built in.
In addition, Apple has included a number of security measures that make attacking a Mac particularly challenging. These include Gatekeeper, which blocks any software than hasn’t been digitally signed and approved by Apple from running on your Mac without your agreement.
However, there are still risks and from time to time Macs have become targets. In fact a report has recently claimed that 2017 has seen a 230% rise in Mac malware. The report, by Malwarebytes, said too that the App Store for Mac is being overcome by scam software, a previously relatively small issue.
Examples of Mac malware
Despite Apple’s best efforts, Mac malware does exist, e.g.
OSX/Dok
Security analysis firm CheckPoint Software Technologies spotted a new OS X malware at the end of April 2017.
Apple rushed to block it.
The macOS Trojan horse appeared to be able to bypass Apple’s protections and could hijack all traffic entering and leaving a Mac without a user’s knowledge - even traffic on SSL-TLS encrypted connections.
OSX/Dok was even signed with a valid developer certificate (authenticated by Apple) according to CheckPoint’s blog post. It is likely that the hackers accessed a legitimate developers’ account and used that certificate. Because the malware had a certificate, macOS’s Gatekeeper would have recognized the app as legitimate, and therefore not prevented its execution. Apple has since revoked that developer certificate and updated XProtect, it’s malware signature system.
The attacker could gain access to all victim communication by redirecting traffic through a malicious proxy server.
See article for more examples
Knowledgeable Apple users, such as yourself, may keep themselves malware-free but others, seemingly, may not … 
Linux is a Unix clone.
I think that there are some false positives thrown up by trial versions of AntiVirus Software.
This may be due to the depth of the scan which they actually carry out.
However, I recently heard a speaker claiming that Potentially Unwanted Programs, or “PUPS”, as highlighted by Malwarebytes, for example, are not an issue and should be ignored.
Anyone thinking PUPS are not important should read this article:-
https://www.howtogeek.com/232791/pups-explained-what-is-a-potentially-unwanted-program/
It shows that they can be very dangerous indeed!
Note: No jokes about PUPS in the context of being doggy jokes, please!