Potty training after 3?

Br

My youngest son is 2.5 and has no interest at all in potty training. He’s also almost completely nonverbal. He says some words, but no strong communication words. He’s developmentally delayed and possibly autistic. I do think he is, and his pedi has told me there’s a strong chance that he is but hasn’t been “officially” diagnosed. They won’t tell he’s 3. I’m worried because my oldest was potty trained by now and Ik you shouldn’t compare milestones but there is so much judgement in my family about potty training your kids. It’s like if your kid isn’t at least partially potty trained by 3, you’re a bad mom and aren’t even trying. It doesn’t help that most of my family doesn’t think he’s autistic and just thinks he’s delayed. It’s like they think one day a switch is gonna flip and he’s gonna start talking and acting like any other neurotypical toddler. It’s very frustrating. And don’t get me wrong, I’m constantly sticking up for him and myself and putting them in their place. I don’t let it show, but it is very discouraging. Even though I know I’m doing good as a mom, I feel like I need to be reassured I’m doing the right thing by not pushing him. Bc Ik that I can try and try but If he doesn’t want to do, he’s not going to. That’s just part of his personality. And the only advice I get is “make it fun, make him want to do it”. By people who don’t have autistic kids. But they don’t understand that if he is not into something, he does not give a flying fuck lol. He literally ignores me and goes off and does his own thing. Getting his attention and keeping him entertained is nearly impossible if it’s not something he wants to do.

Idk I’m honestly just venting 😫