Social conventions are real, well defined things

So are the laws of nature, that Maths arises from

Some mathematicians like to pretend they aren’t, while using a truckload of them; that’s a hypocritical opinion

No, you making false accusations against Mathematicians is a strawman

That’s not to say you can’t change them

You can change the conventions, you cannot change the rules

But all of basic arithmetic is a social convention

Nope, law of nature. Even several animals know how to count.

you can redefine the numbers and operations any time you want too

And you end up back where you started, since you can't change the laws of nature