This. I've worked in this field for close to 20 years (still do a little bit outside of producing vids) and have seen many people fail to get a diagnosis despite having quite noticeable social skills issues. Labelling people (or oneself) as an 'Aspy' or a 'Sperg' if they display even the slightest degree of social awkwardness or unusual behaviour, has become an internet trend lately as cultural awareness of autism has grown. Likewise the tendency for movies and TV shows to pump out 'autistic' protagonists with super-human levels of intelligence and an incredibly rude or socially odd persona (e.g. Hannibal, Sherlock etc) is a really irritating trend that I would like to see die soon. It's misleading and distorts public perception of what it actually means to be on the spectrum.
The bottom line is that many people display social awkwardness, shyness, avoidance of real life social situations and/or difficulty getting along with others. Many people also have very limited, specific interests without ever meeting the criteria for a diagnosis of autism. That's because they are essentially human traits that we all possess to some degree, and some more than others (men more than women on the whole). A diagnosis on the other hand, is about the combination of factors, the extent to which they are seen together, and the stage in the person's development where they first appeared. I have known and worked with many very intelligent, articulate, talkative, confident, friendly and interesting people with autism over the years. I've also know many socially inept, shy and/or downright strange people who wouldn't ever get a diagnosis.
It doesn't help that self-diagnosing various conditions has become a thing now too.