So I do quite agree with your baby, your rules! If you do feel strongly then you're absolutely within your rights to tell them no firmly!
But what I will say is, with my first I was very much like this, very strict on food choices, also not OP but another commenter mentioned strict routine/schedule etc. He is the fussiest child to feed, wont eat veg, would live on bread and chips if he could, he refuses most foods and trying something new is a battle. If he sees sweets he will cram them in before anyone gets a chance.
With my youngest, I was very relaxed! A 5 year gap meant I was completely different as a person in that time, nothing was banned, we followed BLW, no routine regarding meals etc, just fitted in around our lives, his main and pudding were served together 80% of the time. He will now eat anything! He would take a spag bol or chilli or omelette etc over chips, he will eat half the sweets of his brother and walk away. Will give anything a go!
Same regarding the routine, while I do like my evenings without children. My first was 7pm bedtime like clockwork, I'd meltdown if it was later. Hes now the one walking around until 10pm having 300 wees! My youngest again had to fit in, sometimes an activity for my eldest meant bedtime was 8-8:30pm. He sleeps like a dream! Don't sweat the small stuff