If you think that replacing a person with an object cannot be an artistic choice
Literally nobody is saying or thinking that. What we are saying is that there is absolutely no way that OP's prompt contained "...and make the optimist BE the glass itself...".
The irony is that you're giving OP way more benefit of the doubt in your reading of what they produced than you've given me, and instead argued against a complete strawman.
A lot of people think of "venomous" as being a one-dimensional property like strength or speed that you have to build your way up towards. But really it's just how this substance your body produces that reacts with another substance in another creature who evolved on a whole other continent to you.
There doesn't need to be a strong evolutionary imperative to be able to kill a herd of elephants, it's enough for there to not be a strong disincentive not to produce enough venom to do it.