Until the bouquet toss, a 24-year-old guest describes in this Reddit post that she was enjoying the wedding. Two women even encouraged her to participate in the toss because she was unmarried. As far as we know, any woman who is unmarried can participate in a bouquet toss.
Well, not this time. She caught them, and for a moment she felt happy. Then the bride approached and asked what she was doing there if she was getting married the following week, and asked for a redo. The remark was loud enough for everyone to hear. She was not getting married the following week. She was not even engaged.
She has a stable relationship with her 23-year-old long-distance boyfriend, and they have discussed marriage and proposals, but they are not engaged. And none of that means she has a ceremony coming up next week. She didn't deserve to receive that treatment. She participated in the bouquet toss only because she was unmarried and enjoying the party like everyone else.
The guest was so shocked that she couldn't respond. She gathered her belongings and quietly left; once home, she called her boyfriend and cried, thinking she did something wrong. The bride publicly humiliated her using incorrect information, and correcting her would have felt like drawing even more attention to herself, so she decided to stay quiet and try to make sense of what happened at home.