How do you prevent your glasses from fogging?

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no one tucks in their lower lip and protrudes their upper lip to direct their exhale airflow downwards?
 
Why?

At that point there's not much point in wearing a mask at all...

Because the sticky tape is really annoying. The mask isn't flapping in the breeze, its no different to tying the bottom ties loosely around your neck - ive also got a secret to tell you but you can't tell anyone, tying the mask around your face doesn't make a perfect seal...
 
This happened to me until I started twisting my earloops around forming a figure 8
 
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