@ihaveanopinion YABVU. What a nasty spiteful thread. You sound so rude and mean-spirited. If these people 'gushing' over each other, as you so charmingly put it, offends you so much, then just unfriend them, or unfollow if you're too shit scared to unfriend.
Like some other posters here, I like to see people happy, and enjoying life, and sharing their happiness and good news and good vibes with everyone else. You sound breathtakingly bitter and negative, as well as jealous. And mocking people wishing their deceased loved ones happy birthday, is just abhorrent. 
Maybe you should get some new hobbies, new friends, new interests. Maybe volunteer for something, and give something of yourself to someone else. Create some good and happy vibes around you, then you won't be so miserable, bitter, and negative.
(And no I don't write these kind of posts before you say anything! But I do enjoy seeing them and reading them!) I rarely post anything on Facebook.