If you asked your wife "is it ok if I did X" and she said "YES, its not ok to do that.." would that be normal behavior?

Ah I see now. Maybe my brain translated the question implicitly to "Are mums poisonous to cats?". I'm tempted to say it's a minor quibble, but on the other hand, there are probably a good deal of people who may stop reading after "Yes"

Right and someone in a hurry quickly checking their phone may read the affirmative response as an OK.

It's worse on mobile with large text in my example - https://imgur.com/a/wvNspMT

Imagine your parents asking about a drug combination using an old iPhone SE with large text enabled.

"is zazzafraz and banza ok"

Yes zazzafraz (long scientific name 1) and banza

(long scientifgic name 2) are toxic in combination