Another "Well Done, Sir"! And no, I don't think you drove the wedge - it was there, invisibly. You might find it hard to believe how jws talk about disaffected ones: walking dead, mentally diseased, satanic God-haters, bird food at Armageddon - it's revolting and completely UNChristian. Without doubt - the wt teaches HATE.
Because of that 'inculcation' some, but not all, jws have to work at not displaying basic natural affection, kindness, mercy and forgiveness. Those types have an especially hard time mingling with 'worldlies'(anyone NOT a jw). The nasty stuff would've boiled to the top sooner or later - it doesn't go away. You only shined a light that needed to be shone.
Your anger was more like righteous indignation, as you were speaking up for what's right and just. If the moment had passed and you'd said nothing... you might be kicking yourself right now for not doing the right thing - and it's always the right thing - to stick up for your wife when she's being treated badly.
Remember - You don't have to play by their rules... if you knew all the wt cult's contrived 'commandments' you wouldn't even think twice! If anything is good and true, it's that LOVE rules over all - and your words came from pure love.
BTW - what was your wife's reaction to all the goings-on of that day? Surely she doesn't blame you for anything, does she?
In Hope, Watkins