No issues for me. I prepare myself in advance so the security check is mostly no problem.
Tips:
Always ask for accommodations just after or before you book your flight. Airlines and airport may offer some. It sadly depends on them and the local legislation.
The first thing is to read all you need to know for the security check.
The liquids have to be in a closeable plastique back. The ones for the freezer work fine. The plastic bag needs to be placed in a easily reachable place.
The same applies for all your electronic devices including headphones/earphones, chargers, etc. Place all of them in a easily reachable placed plastic bag. At the security check, you need to pull out of the bag just one plastic bag what make the whole process quicker and easy.
Depending on where you travel, at least in the Schengen area it's fine to take your solid food with you through the security check. You can take your confort food with you. You can let the food in the cabin bag. The same applies for empty plastic bottles. You can take an empty bottle through the security check and fill the bottle in the toilets.
All the usual stuffs for the hyper-/hyposensitivities like headphones, stimming toys, comfortable clothes (it's not the fashion week /s), etc.
In the airport, there may be a quiet space or room. It's helpful for the anxiety. If the airport has a specific accommodation, I recommend to use it if it fits your needs. You have the right to do so.
In the airplane, if there is free rows, you can ask to move there to be alone.
It's a good question. I don't really like it. It implies the divergence of a norm dictate by capitalism. In fact, the neurodiversity paradigm is in opposition of having a neurological norm.
The neudifferent is better. We are all different from another and it celebrates the uniqueness of each human. It implies the paradigm of reciprocity. Neurospicy and many others are fine too.