No. While it’s true that doses of different substances that work in exactly the same way can sometimes add up, different substances being described as ‘endocrine disruptors’ have different ways of interacting with the endocrine system. Some would actually have directly opposite effects.
For example ,some mimic particular hormones, while others block the action of the same hormones so they’d cancel each other out.
And in any case, the potential effects of many ‘endocrine disruptors’ would be completely swamped by all the naturally occurring substances we are constantly exposed to, whether those are naturally produced hormones or phytoestrogens in our food for example.