What a bewildering number of the posters on here seem not to have grasped, is that not everybody feels exactly the same as you!
It may not be commonplace in your friendship group to celebrate one's spouse on social media. Fine. Nobody cares or is criticising you because you don't do that.
But the poster and her friends and family clearly do. And why the fuck shouldn't they? Just because you don't, it's inherently wrong? Do you think this of all cultural practices that are not your own? Jesus, the spite and vile, just because this woman dares to like and value something you don't....
OP, I can't directly empathise, in the sense that I have never had a partner who was a great social media user so I have never been in a position where I have expected posts like that. (I do use social media myself and sometimes use it as a platform to express gratitude for my friends and family - my mom, for example, is a fan of a sentimental post, as surprisingly is my 95 year old dad, and if it makes them happy.....)
I am imagining you feel as I might feel if a partner forgot to get me a Valentines gift, for example. I would be a bit needled but the best thing is to talk to him, rather than letting resentment linger. He probably didn't realise it was something you valued so much.
And ignore the spiteful people on here. You are completely entitled to like stuff they don't.