system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5. How come it is bad to rub your eyes?
gpt
If you feel the urge to run your eyes, it is likely because they are dry and irritated.

Touching irritated tissue just makes the irritation worse, because you are very likely to spread the cause of the irritation around (foreign body, dirt, etc)

Also your hands are very dirty and spreading bacteria on your eyes would not help.