Shoulder-to-hip ratio is deciding factor.
I've known my entire life that my 1.20-to-1 ratio is part of the subconscious reason that others will never be able to really see me as a human being. I've always known. I can remember being seven or eight years old and noticing it. When I was so skinny I could have turned sideways and vanished. I knew it was the ratio that determined whether or not you could be regarded as "human."
The huge back, if matched to a waist (lean or fat, doesn't matter) of approximately the same size, brands you as a slave or servant or "non-person" to Homo Sapiens. They are incapable of seeing you any other way. The "real" humans have narrow hips and broader shoulders. It doesn't matter if this is a serious detriment in close range combat and virtually guarantees they will lose in a hand-to-hand conflict. This build has only one purpose and it is fighting at a distance, not close up. This build is for hurling projectile weapons at a distance. It doesn't matter if this build is actually physically weaker. This is what is attractive to the Homo Sapiens female.
A Homo Sapiens female might find you attractive in some other way but it will never translate into any real affection or desire. To a Sapiens, a man with a waist matched to his shoulders is a slave who cannot be regarded in the same way we regard a real person. They don't know why they feel this way. It is instinctive, innate and ingrained.
How on earth did they develop this subconscious discriminatory evaluation without even being aware of it?
Because after eating the Neanderthal males and gang raping the Neanderthal females, they kept the hybrid male children as slaves in a narrow caste for at least 20,000 years afterwards. You can be assured that any Homo Sapiens female who showed any sexual interest in one of these slaves was likely to be ostracized or put to death. They were not real people. They would stand on the outskirts of the tribe or sleep on the open ground and (according to Celtic mythology) were forbidden to look anyone in the eye. The women were instructed to consider them as little more than dogs who stood on two legs.
The tribes that developed these caste systems (according to Celtic mythology) were victorious against anyone who opposed them. With Neanderthals as shock troops in the battle, it was a simple matter of coming in behind them and mopping up. With Neanderthals as scouts and watchmen, nobody ever got surprised, especially not at night. With Neanderthals fashioning your tools and honing your weapons, every spear flew straight and every arrow hit it's target. With Neanderthals tasked to fish, hunt and forage, your tribe was freed up to plot strategy and consider the big picture. Once you had a large mob of Neanderthal slaves, everything came easily to you and victory was always within your grasp. It was these tribes that conquered all others and it was their genes which came to characterize the European genome. All you had to do in life to succeed was to learn how to manage your Neanderthals wisely.
There are great parallels here between the Romans and their Greek slaves, who were clearly smarter and often stronger than their masters. The difference being that the Greek slave could often be recognized as a human being, only of lower status or authority. The Neanderthals were strongly typed from the beginning as the "not-human." The living ghost. A creature that one wields as one would use a hammer or a tool for some job. They were only required to be acknowledged when one was giving them orders, otherwise they are faceless men standing close by, waiting to be given purpose and direction. Females would be descended from other females who learned the proper regard for their kind and did not see them as possible mates or even as men in that way.
40,000 years later, nothing at all has changed. Not in the least. I can take you into any workplace in the world and point them out. There, there and there. They are the ones at their desks working, the others stand and chat and speak of how easy their lives are, of their plans to go on vacation, of their leisure time, of their luxury and the great ease with which they navigate their lives. This one here who is working is only a tool, to be tolerated as long as it is necessary to obtain his services and then he is invisible again. When a deadline presses, suddenly a smile is available and perhaps even eye contact. Like a carrot held before a horse, there is dangled the prospect of them becoming a full human in standing if they will only work hard and deliver what is required on time. When the deadline has past, it is like this same one became as transparent as glass. No one looks at him. They merely look through him.