Not sure if related, on top of autism it could also be that I have aphantasia and anendophasia and a bit of ye old ADHD for good measure. With that being said, I am so damn picky I annoy myself. I do not like mixed stuff. No flavour combos of any type (Juices or food). Just meat and potatoes, rarely sauces (Just Lawrys seasoned salt). Vegetables literally make me ill and fuck up my gut and going to the bathroom. Good thing all veggies taste like charcoal to me or I would be tempted to eat them. I only drink water, the odd fruit juice if it is real, hot chocolate or tea made a certain way. To make things really weird, I love Marmite. I can eat it straight out of the jar. Very bizarre for someone who hates veggies.
It really sucks but my palate is my palate and I have to live with it.