Although the idea of blocking such sites in users host file is not bad, for most users it still represents a challenge. What we need to do is report such sites as phishing to
Google. In this way such sites will be blocked for every user, even those who are not aware of the problem will be protected.
On Firefox you can also access this link (with the URL pre-populated by the page you are visiting from) by click on Help -> Report deceptive site. I've tried to make the instructions to edit the hosts file as simple as possible - you literally just locate the file in the directories I have listed, open it with a text editor, paste the code at the bottom, and save it. Most users should be able to manage that.
It is also important to use adblocks for browsers, since most users use search engines to find Electrum site, and bad ones usually pops up at the top of the search list. The last line of defense is antivirus software which should be updated, and good AV will analyze any downloaded file and prevent the user from installing bad software.
You shouldn't be using a search engine to find sites like electrum, myetherwallet, binanace, this forum, etc. It is much safer to manually type in the URL. Ad-blockers and antivirus are a must (in addition to extensions like HTTPS Everywhere and Privacy Badger), but you can't rely on these to protect you 100%.