I'm in my 50's, and can remember a time when there wasn't this awareness of men's bodies. While it was admirable to be fit, and women certainly appreciated muscles and a lack of a beer gut, it wasn't seen as that important. Men could be flabby and still seen as physically attractive.
Moobs are normal. Not being able to grow a thick beard is normal. Body hair, or any hair, or not, is normal (I could count the number of hairs on my chest in my 20's and never once considered this to be unusual or in any way affecting my masculinity). I have friends who were balding in their mid-20's and that was normal.
The difference between 30 years ago and now is not in men's bodies. It's in our attitudes to men's bodies.
Men (and women, as always) are being taught to hate our bodies because businesses can profit from that emotion. We are being told that no-one will love us unless we're taller, stronger, hairier. We're being fed images of "perfect" men as aspirational targets that we should aspire to match (and to get there we need to buy a bunch of products, obviously).
We need to learn that all bodies are different, and all are acceptable. It's normal to have flabby bits. If you have to hate something, don't hate your body, hate the people telling you that your body is not good enough.