There are many, many things out there which blur some important lines, particularly those having to do with Metatech. There are also so many ways for "infection", to truly attempt to protect yourself requires drastic acts like heterolinguism. So what do you do?
Stop caring. What's the difference between someone convincing you of something using an argument, and using metatech? What's the problem with a drug changing you over time? People change - and they change because of what they've come into contact with.
Heterolinguists attempt to cut themselves off from this, because they fear it. Collectors think that these attempts are both way to drastic and eventually doomed to failure anyway, so why cut yourself off so much from everyone else? Well, you know what they say - if you can't beat them, join them.
If you can't protect yourself from all the metatech "diseases" out there, invite them in. All of them.
At some point all the pulling equals out. Absorb the memesphere. Long cat is long.
Partial inspiration to Pneumonica's Qualia lenses; "embed a metatech virus in a popular lens, and you get something that slowly changes the user into something else every time they use it." Alright… don't normal drugs do that? And isn't that kinda true of everything?