I don't think wearing heels anyway would be PA (why is everything but everything designated PA these days? It makes me crazy). It is a request, not a command. I would just ignore it and do whatever i was going to do anyway. If they had the gall to say something about it, that is when i would leave. I would imagine most people by that point would have other things to be worried about that what is on their guests' feet.
Bolding mine ^
Because in this case wearing heels after the bridal couple has asked you not to is PA. You have the option of declining to attend.
Sometimes PA is okay. It cannot be said to ALWAYS be wrong. In this case, I think everyone should be PA and wear whatever shoes they want to. I would not miss a wedding I wanted to attend just because the bride was on a power trip over something this stupid. What if the groom were my relative, or good friend? Not attending the wedding would be like cutting off your nose to spite your face.
This is one of those requests that is just so absolutely ridiculous ...
Yeah but if it were my good friend or relative, I'd just suck it up and wear flats even if I wanted to wear heels. If you want to go to the wedding you can either wear heels or you can wear flats. Rather I be grumpy than the happy couple. Even if their request is ludicrous. I'm sure all of us do things every day to please people, even if their requests are irrational (within reason) and to attend someone's wedding day I love, i'd do it if it was important to them. You don't have to sacrifice going to someones wedding you want to so it's not cutting off your nose to spite your face. You do actually have the option to wear flats and go. You just have to weigh up "how close you are to the couple vs how much you don't want to wear flats." For someone you're not close to, the decision is a lot easier.
Don't get me wrong, this is an absurd request and the couple are being silly but if I truly wanted to be there, i'd just wear flats. In the grand scheme of things, it's not the worst of worst attire requests they could make. The request is idiotic, but I wouldn't wear heels if it's something that was important to them.