When I gave birth to my baby not long ago, my DP put an announcement on Facebook. His sister commented under the post, “Congratulations, David.”
I said to DP that she has intentionally neglected to congratulate me, or acknowledge me in any way, as a way of showing her dislike for me. DP says her message is perfectly fine and contains no hidden meaning.
So as not to drip feed, his sister has spoken to him in the past of her dislike for me, and I have not seen her in about seven years, because I didn’t enjoy her rudeness towards me. Also, just to clarify, I am not upset about the message (I have had a good giggle about it), nor do I think it is an important matter; I simply wonder if other, more objective people would think she meant to be rude, or if it could simply be an oversight on her part. I suppose I’m hoping you’ll all agree with me so I can show the result to DP and say, “SEE?!” 
YABU - she didn’t mean to be rude by only congratulating him.
YANBU - she intentionally only congratulated him to be rude.