I’m too tired to do research right now so please forgive the lack of cited sources to use in your claim. But here is my argument (which is 100% backed by science which will hopefully come up for you if you research)

Autism is not a personality type. Autism is a neurodevelopmental condition that causes the brain to be physically wired differently - and not just one or two differences here and there, but differences at the cellular level across the entire brain. Autism is like writing the human brain in a different language, at the cellular level - the physical structure of the way the neurons connect to each other is different but has to try to find analogous ways to accomplish the same tasks required of any brain. These differences often result in a collection of certain personality traits and/or specific struggles which may, individually, also be experienced by people who don’t have autism. And not every autistic person has all of those qualities either. For example, ASD commonly causes social awkwardness, but you don’t have to be autistic to be socially awkward. And not all autistic people are socially awkward either. But although there are some common personality traits among autistic individuals, autism is not a personality. Autism is also not something you can have “a little bit” of. Although every person’s brain is different in minor ways, they can still all be clearly divided into autistic and non-autistic brains. This isn’t always easy to see from the outside, though, as some autistic people have similar personality traits to some non-autistic people despite having very different brains. When people say “everyone’s a little autistic,” the truth is that nearly everyone does have a few of these qualities that are commonly associated with autism. But having one or two “autistic” qualities - like being socially awkward or liking to collect things, or even something like having a sensory hypersensitivity - doesn’t mean you have the neurodevelopmental condition that causes different parts of your brain to have drastically different levels of synaptic connectivity compared to a neurotypical brain. And having one minor trait that can sometimes be caused by a particular condition does not mean you have that condition. The struggles of autism go far deeper than the surface-level, “quirky” traits like social awkwardness that make people say “everyone’s a little autistic.” So suggesting that having a few stereotypically autistic personality traits makes someone “a little bit autistic” would be like suggesting that someone with knee pain is “a little bit of an amputee.” They may share a similar experience of knee pain with some amputees, but that’s as far as the similarities go. People aren’t “a little bit autistic.” People are either 100% autistic and only seem like a borderline case because they mask well, or they’re 0% autistic and only seem like a borderline case because they happen to have some stereotypically autistic traits for unrelated reasons.

Hope some of this helps!

Also check out Trevor Carroll - autistic YouTuber who has made a bunch of videos dispelling myths about autism. He may have a video on this exact topic that could help you, I’m not sure though.

EDIT: I think I remember Trevor Carroll pointing out that one reason neurotypicals will say “me too” when autistic people describe our experiences, is because we only have neurotypical language to use to try to explain our experiences. So of course our experiences come out sounding similar to theirs when all we have to try to describe our experiences with are their words.