People were pretty confused why the bride didn’t react immediately by throwing out her mother-in-law or why her husband didn’t say anything. And why wasn’t there a guest who “accidentally” spilled red wine over that dress?, she explained that she and her husband were so focused on each other and having such a good time that the dress didn’t faze them.
The woman never expected to be insulted because she never provoked it, so she didn’t have a response ready. Her wedding was an occasion she was least expecting to be humiliated and when she was, her brain reacted by blocking out the trigger to deal with it later. You may think that this is not a big deal and wedding guests should be allowed to wear whatever they want. In part, it is true that someone else’s outfit doesn’t affect you in any way unless you allow it to get into your head.
According to The Pink Bride, proper etiquette says that the color white is reserved for the bride: “it is assumed that all other ladies other than the bride in attendance at the wedding should refrain from wearing white to avoid seeming to rival the bride for focus. Naturally, this restriction doesn’t apply to men, who will likely wear white collared shirts with a colored jacket and tie to your wedding.