There is a trick that can help when a site gets shouty about Ad Block. Ghostery, another crap blocking add in, does a lot of the same stuff, although it's not quite as effective at blocking all ads, and tends to replace them with a place holder where as Ad Block usually removes them completely. However, I've never seen a site refuse to play until I turn it off, and it does block the content of ads, so even when you see them you just see a blank box and no connection is made to the virus polluted network being used.
It's worth noting the ads that cause the problems do not come from the sites themselves - they tend to keep their own sites clean of attacks as it drives away business, but as only certain dodgy ad networks will allow the flash streamers illegally rebroadcasting to use their networks, the streamers and sites have little choice and those networks are not properly regulated by themselves, so hackers can plant viruses on the ads on the network.
The other vital thing is having a decent and up to date AV to stop anything getting through. Learning a bit about browser settings and when not to click stuff, keeping your operating system up to date and all installed software like flash, java etc is also pretty key. The internet is like driving - you can stay away from certain roads and junctions and stay ultra safe, or you can equip yourself with the skills and knowledge to walk the edge of the precipice while keeping yourself safe. Personally, I don't use flash unless I have to, p2p is a much better option. Acestream works well, although they also have an issue with their browser add in, which causes pop-ups to appear from a Russian ad network.. which sometimes includes malware.
However, disabling the add in and watching streams through the VLC based stand alone player solves that problem completely.