Dubious is the polite word for it.
The phrase "everyone is a little bit autistic" is really bloody offensive. It trivialises autism and is absolutely not true.
There's a number of psychologists who I've heard expounding this view - but when you ask them to explain how this fits in with brain MRI changes demonstrated in autistic people, there's no answer.
No, we're not all a "little bit autistic" in the same way we're not all "a little bit pregnant" just because we get swollen ankles or food cravings sometimes.
Where some confusion lies is the fact that neurotypical people might have some character traits which are typically also associated with autism - such as noise aversion, or dislike of change. The difference is that those traits occur in isolation, and typically at a very different intensity to what is experienced by autistic folk.
There are some autistic people who undoubtedly have very profound and severe difficulties. But even individuals who would previously have been described as "high functioning" (a term no longer used) can have times of extreme difficulty. In addition, autistic girls and women tend to mask heavily and privately there can be very marked effects on their mental health, their well-being and their functioning.
Suggesting that individuals should only get a diagnosis if they fit into a crisis category is abhorrent - and it demonstrates the ableism inherent in our society today. If you have mental health difficulties, no one would be suggesting that you should be prevented from accessing help unless you were suicidal. And that's because we recognise that early intervention can prevent long-term damage. The same applies to autism.
The fact that the NHS is so broken it can't cope with legitimate referrals is a whole different issue. Every autistic child should be able to access a diagnosis, because if they don't, many of them will go on to suffer significant mental health difficulties in their teens and as young adults.
More funding would be wonderful, but even without that, there's a lot of changes that could be made. CAMHS isn't fit for purpose and there's a lot of extra agencies and red tape involved that doesn't help anyone.
Even now, before these changes are brought in, you can't just "get referred for an autism assessment" because your child is behaving badly and you suspect SEN. You need evidence from the school and from other health professionals such as CAMHS, SALT, Educational Psychology, ATS etc to back the referral. GPs aren't supposed to make a referral just on the parent's request - and in my experience, it can be a huge, huge battle getting the GP to agree to refer.
I'm speaking as the mother to two autistic DC, twins, one DD, one DS. DS has very significant needs indeed and was diagnosed aged 3. DD wasn't diagnosed until age 10 when she started to struggle. Her functioning was below that of a 6 yr old in many ways - but no one spotted it at school. THIS is why a referral matters - even if it's not immediately obvious that a child is in crisis.
And yes, I'm autistic/ADHD too.