In article , says...


You're clueless..
Wet areas such as showers require a water-resistant substrate. Be it
mortar or tile backer. Drywall is NOT an acceptable substrate in those
applications.

Also, thinset has been used as a setting agent for installing tile on
drywall since it's inception.



To clarify, in wet areas DO NOT install ceramic tiles over drywall, use
cement board as a substrate.

"If it's going to be a wet-area application, like a shower, I wouldn't
recommend it" - I wouldn't recommend installing tile over drywall.


In a kitchen backsplash, installing tile over drywall using a mastic
adhesive is o.k.

I evidently didn't make that clear enough.


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