First, acquaint yourself with Maslow's hierarchy of needs: http://www.simplypsychology.org/maslow-pyramid.jpg

Now, consider the typical life of a slave. In most cases, you are kidnapped and sent to work for a rich family. You're given board and food for free. You're set to work with other slaves, many of whom come from similar backgrounds to yourself, and who you'll necessarily have a lot in common with. You are permitted to engage in sex if it presents itself to you (see: african-american slaves and the growth of the african-american population).

Now refer back to Maslow's hierarchy of needs. Let's work out what is fulfilled by this lifestyle.

food, water, warmth, rest

Yep. Your employers have a vested interest in keeping you alive, so you're given food and water. Warmth and rest are a given for the same reason - they don't want you to die and they want to keep you productive.

security, safety

Also present. You're given somewhere to live (which is why slavery is logically non-existent anyway) for your efforts.

intimate relationships, friends

Yeah. You're almost certainly going to come into contact with a lot of other slaves. What is the foundation of friendship? Proximity and common interests. Proximity is a given since you share living quarters, and you're certain to have common interests by virtue of having identical lifestyles and probably being from similar cultural backgrounds.

prestige and feelings of accomplishment

Slaves have done many wonderful things over the course of history. They've built roads, castles, even entire industries. It may be a hard job but it is a noble job.

achieving one's full potential, including creative activities

Okay, most slaves don't have this. But many of them are surrounded by nature on a daily basis, which would definitely inspire creativity in a not-insignificant number of them.

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Now, let's compare the above to MY life as an autistic 21 year old incel who has never had a job. My life surely follows the trajectory of many other incels' lives. I have no social interaction whatsoever, and my looks and personality preclude it from ever being a part of my life. I am provided for by the state, and as it's not a symbiotic relationship they have little interest in keeping me alive compared to the slave owners. I have no economic prospects and my autism and looks prevent me from ever having any.

Let's run through Maslow's hierarchy of needs again, for the incel's life.

food, water, warmth, rest

Most incels in first-world countries (at least most with an online presence) have these, but only tenuously. Since we incels are unable to provide anything of value for anyone else, no-one has any inherent interest in keeping us alive. The government cares about us only insofar as they are required to show basic compassion, which can easily be thrust aside by the voting public in times of crisis.

security, safety

As above.

intimate relationships, friends

Obviously we have none of this. That's why we're incels.

prestige and a feeling of accomplishment

Feelings of prestige and accomplishment in our world center around your job. A high percentage of incels are NEETs and so naturally won't get any of this, but consider the following; the reason a man's pride comes from his job is that it means he's able to provide for his wife and children. Incels will never have a wife or children, and thus cannot derive feelings of prestige or accomplishment from their jobs.

achieving one's full potential, including creative activities

Incels have more downtime than slaves to pursue self-actualisation, but one of the underpinning theories of Maslow's hierarchy of needs is that it cannot be achieved without first achieving the lower levels of the pyramid.

So, in literally every compartment necessary to have a good life, slaves beat out incels. I'm sure most incels knew this already, but I just wanted to make it absolutely clear for our normie friends that the life of an incel is truly horrific, and one of the worst fates imaginable.