See, now, you've poked the bear. No the heck we wouldn't. IC is a disability involving the diagnosable functional need for one or another disabled toilet. A diaper fetish doesn't matter at that point, because functional need for that place outweighs the fetish, unless said fetishist was doing overtly, meaning open to view or knowledge; not concealed or secret, sexual stuff in the stall, which isn't legal anyway, because it's indecent, no matter what anyone's functional needs are.
I know you have Asperger's. At least I could swear I've seen you mention it on other threads. Am I right, Angellothefox?
Either way, unless it impairs your ability to hold it, let it out, or use the toilet, you have some other disability that does cause a functional need for said places, or, no other stall is open, you're not legal to use a Changing place, or regular disabled toilet. Good thing no one would care to prove you a faker. Helping someone with a functional need for said places qualifies the helper to help, not to use the facility for himself, or herself.
Being diagnosed with a disability isn't enough. Diagnosable functional needs decide what's legal. E.g., severe, life threatening depression is a disability, but without functional impairment in holding it in, letting it out, or using the toilet, severe life threatening depression doesn't warrant a changing place, or a regular disabled toilet. Now, if said severely depressed person had a Service Dog, also known as an Assistance Dog, task trained to prevent self-harm, and the dog and handler couldn't fit in a regular stall, then yes, said person is legal, because he or she has a functional need for the dog, and they can't both fit in a regular stall, so, the severely depressed person is prevented from using the regular toilet, especially considering he or she might be more inclined to self harm, somewhere private, like a loo. See?
As an example of functional needs, my stepdad has CP, but, in disaster evacuation, he goes last of the 3 cerebrally palsied people in my family, because his functional needs are least among us, but, if he got severely injured, and sis and I were fine, his functional needs would have changed, and he'd go first. See? He's also got a disabled placard, because walking gets hard for him in rainy, snowy, or any kinda slippery weather, otherwise, he only uses it if he's injured, or has me, or sis, in the car, since we need a loading zone, no matter what.
He may use a disabled toilet, but only on a very bad day, because he usually doesn't need a rail, but, if his functional needs change, to the point where he needs a rail, e.g., if the floor in the regular toilet were slippery, or, he needed a sink he could reach sitting, a mirror in the right spot, anything a regular disabled toilet provides, then he's legal. He would qualify for a Changing Place though, were he to have an accident, no matter if he needed anything else a disabled toilet provided, or not, because he has bladder spasms. See the functional need for 1 over the other?
For the record, even though I'm IC, it's mild, so, unless I had a real accident, I wouldn't use a Changing Place. I'm also a Little bABy. I'd know if I had an, "on purpose," and, in that case, wouldn't use any disabled toilet, because my conscience would stop me! I'd go home and change then.
Now, no one should even try to stop you from changing in a regular toilet, and throwing the nappies in the bin. Dirty disposable nappies go in bins. You're not hurting anyone by using and changing in public, but, I don't care if you're changing your butt, or doin' the bloomin' hokey pokey! Y'ain't doin' anything legally, in a Changing Place, or a handicap stall, unless you have a diagnosable functional need to be there, you're helping someone who does, or no other stall is open, so, stay outa loos you don't need!