Who makes short men feel insecure? Women do. Both short women (5'6"/167 cm and under) and tall women (5'9"/175 cm and up). And it starts early too, so most of these guys start feeling like crap by the time they're 10-12 years old, assuming they never get a growth spurt. I can't tell you how much I hate my body and have major BDD because of my shitty height and how I'm just two inches/5 centimeters away from being "acceptable enough" to modern Western women. I've since given up pursuing women and jeopardizing my self esteem because wasn't lucky enough to reach 185 cm or taller, so I don't care what women demand from men anymore.
But I tell women who claim this crap that I've had hundreds of women reject me for being too short (among a few rare other things, like looks or race) and have rarely met any men who have ever said "I wouldn't date her; she's 5'10. Gross!" Ironically, according to the data, the only men to even have height preferences are really tall men because they associate tallness with masculinity. While the vast majority of women ALSO associate tallness with masculinity. You'd think tall women wouldn't, but they still refuse to date men who aren't 6'2"/ 188 cm+.
If you're under six feet, not rich, and unwilling to simp to literally any woman who doesn't respect you but "puts up with you" cause she's getting paid for it, then don't even bother.