I do get sick and tired of children who are just badly behaved, (and badly brought up,) being given the label of ADHD, when it's just bad parenting.
Autism and ADHD are not labels, they are clinically diagnosed conditions and they are not just "given". It is very difficult to obtain a diagnosis, it takes years and multiple rounds of assessment. The stress is enormous with your home life and parenting picked apart, school observations, cognitive assessments, etc. You don't just rock up to the clinic and then walk away with a diagnosis.
I have seen parents punch the air with joy when ADHD was 'diagnosed by a 'specialist.' Because it gets them off the hook.
Where are you hanging out that you see this? Because I call bullshit.
Also, many children who are out-of-control, and badly behaved, seem to come from the same type of family and environment
I don't see what this has to do with autism or ADHD? Neither condition is caused by parenting or home environment.
Also a good point someone made, is that no-one seemed to have food allergies some 35-40 years plus back either!
Allergies have always existed but back in "the olden days" the people with serious allergies would have died of anaphylaxis only they didn't know what anaphylaxis was so it would have been recorded as apoplexy, swelling sickness, poisoning, etc. In earlier history it wouldn't have been recorded at all. A lot of babies with CMPA or children with coeliacs, etc would have died, think of all the times in history where you've read about infants failing to thrive, being sickly or frail, and eventually wasting away. We have writings dating all the way back to Roman times discussing allergies and observing that which sustains one man is poison to another as well as writings discussing "spring time rhinitis" (aka, hayfever).
I am just stating my opinions
Which have no basis in fact.
I believe autism and ADHD are genuine conditions. I just don't believe every person diagnosed with one of these conditions, actually has it.
Substitute the words "autism" and "ADHD" for cancer or diabetes or epilepsy and you will see how ridiculous you sound. I presume you have mo medical training? You are not a neurologist or a paediatric neurodevelopment expert?