As others mentioned western/American fashion had sporty types wear crop tops in the 70s-90s
Here is Will Smith wearing a crop top in Fresh Prince From Bel Aire imgur.com/a/0OAZRpi
And yes - if you hang in certain circles men wearing crop tops is still perfectly acceptable. But currently it’s usually associated with femme-presenting queer men of other wise gender noncomforming people.
Straight men seem to have have shunned the look (as they tend to) when it became associated with queerness.
And. Of course all of this is US centric. Plenty other cultures and fashions out there.