We normally do holiday village - I'm fairly sure holiday village and Tui blue are pretty similar. What things does he struggle with in general?
I know food can be a concern -
Food wise the buffet has a range of breads, a range of cheese, plain penne pasta or plain spagetti - add meatballs or bolognaise or just sauce yourself, lots of ham..
I'm only mentioning them as they're the ones you mentioned there is also loads of other stuff -
breakfast = help yourself to pancakes, waffles, cakes, donuts, eggs boiled scrambled or fried, bacon, sausages, a station where they will cook crepes or omelettes how you like it, fruit bar, salad bar, cold meat section, breads for roasting or just eating as is, 2 or 3 flavours yoghurt and cereal. The usuals on the cereal - Rice Krispies, shreddies, Cheerios, coco pops, corn flakes... ours ended up eating a lot more than he would at home
Lunch and dinner are similar though lunch doesn't have the toasties,
mix of toasties with ham or cheese, pasta (plain - add your own sauce/cheese) chips, pizza, variety of vegetables, potato's, rice dishes, a hot meat station with 4 or 5 options, cold meat station with a range of hams/other cold meat slices and cheeses, bread again - toaster not available I don't think. Carvery days etc. there's also vending machines with crisps etc at the sites and usually a much cheaper shop a close walk with them and other items - we took a load of oat bars as we knew ours would miss oat bars but everything else we ate from the site.
It's harder if you go to one of the speciality restaurants as you're given a menu to pick just one starter, main, dessert from. I think you can ask for these in advance of your holiday - I asked for them at reception before booking and only did one of them once as the others I knew my little one wouldn't eat there and it seemed a shame to have to eat there then go to the buffet for him after!
Depending on what you are looking at many have beach access as well as swimming pools plus water splash park. If he's into water the splash park/slides are a godsend!! Ours spent so much time at the one in Ibiza it really made the holiday. :) we do beaches too which he likes for a while but it's the water slides that are always the main attraction!
Have a look/maybe make a shortlist and I'm sure you'll get people with experience of those exact hotels :)
If noise sensitive to you guys and you'd prefer to sleep in different rooms him/you then the holiday villages and tui blue also have rooms where you have a bedroom seperate to where the child is sleeping which works really well for us.