Hmmmm, why some people do this? Haven't got a good thing to say about anything, but happily chip in with criticism and negative comments. My mum was a bit like this, but that was because she favoured my brother and I could never do a thing right - and God forbid she said anything nice to me. From my hair, to my figure, to my job, to my clothes, to my driving, to my parenting, always a snide about something ... and a little dig every single time I saw her. It made me so insecure - and eager to please people (as a younger woman (under 45.)
And my DH used to be like it. I wrote a few short stories and a short novel, and asked him to read them, and he had about half a dozen negative things to say about all of it. I wish I hadn't asked! But also, he used to have something negative to say about everything I cooked/all food I prepared as a meal. Too dry, too cool, too hot, too salty, too greasy, bit bland, could have done with being in the oven a bit longer, wouldn't have that again.... at least 2 or 3 times a week. He stopped doing it, when I grabbed his plate and threw his meal in the bin once, and carried on eating mine and refused to cook for him for a month. And that was because he started begging. (This was maybe 12-ish years ago,)
He also used to berate what I wore, so many negative comments. One time (some 25 years ago,) he told me my 'fat' is bulging out in this particular dress. (I was 9 stone, and had no 'fat.') I told his mum and she said 'you cheeky little cunt, she looks lovely, she's got a smashing figure!' Luckily his mum adored me. I was the daughter she never had, and she ripped into him when she found out he had been mean to me. She died 20 years ago sadly... She said 'he is trying to bring you down because you look great and he doesn't want you to get too confident and leave him for someone else.' Bang on, MIL!
I also put a load of lovely new gravel in our back yard, about 6-7 years ago, after spending 2 hours pulling up all the weeds, and also put some bedding plants in the flowerbeds, and it looked so nice. I painted the shed too. Took the whole day. All he said was 'didn't really need doing, he wasn't sure about the shed paint colour, and the flowers needed to be closer together (they didn't as they grow 3X the size!) It looked so pretty and he didn't say a good thing about it. I just burst into tears. he said 'what's the matter!' with this face >>. 
And I told him. 'You always have something negative to say about EVERYthing I do. You can't just compliment me and be nice can you?' 😢
He was really contrite and apologetic. he said 'I'm sorry - I just say things before thinking.' I said 'that's no excuse, you are still slagging me off, and the garden looks fucking gorgeous. Why not just say so?'
There are quite a few more examples. Including one where I painted and decorated the spare room, and DH just slagged it off. Not a single compliment.
Upshot is, (some) men don't like women to be too confident and they don't want them getting ideas above their station and thinking they can do stuff better than the men! (Which of course women can - and do!)
Since the 'garden incident' (6-7 years ago) DH has never critisized anything and is always nice about everything I do. I don't need constant compliments, and no criticism ever, but he never ever said anything nice or complimentary when I did something. Now he does just the opposite! Always nice. I'm not complaining! 😆
@FlabMonsterIsDietingAgain Sorry no advice, except what a pp suggested, and what I did - TELL HIM that he is upsetting you. 