This didn't happen to me, but it happened to my best friend. Just curious on other opinions as to if it was rude.
Mutual friend X invited myself, as well as most of our social circle to her wedding. Plus ones and children were also included, so I don't feel this was a close-knit family and friends only situation. She excluded best friend. Best friend and her were close, not best friend close, but still kept in contact and hung out semi often. Mutual friend even invited her to the engagement party but excluded her from the wedding. Of course that's already a no-no. Best friend and X remain just as close between wedding and baby shower. They haven't drifted apart, but they haven't gotten any closer.
Best friend gets an invitation to the baby shower.
To me, that's like saying "You're not good enough for me to pay for a meal and drinks and cake/favor for you, but please feel free to bring me a gift to another party that someone else is paying for." So best friend was venting to me about it. I'd definitely be annoyed if she had done this to me. I told her I would decline.