There isn't such wiggle room in math as there is in English/language, though.
2+2=4, and that's a fact, and so if you say 2+2=5, you're just wrong lol. So there's no wiggle room for "math is evolving".
Drawer is correct, draw is wrong (in this situation, when referring to a chest of drawers), but if I point that out, I'm a pedant and "language is evolving".
As to laziness in math vs. laziness in written English, I think it's because like a PP said, we're seeing more written language because of the internet. So the laziness is more obvious. Laziness in math has more real-time, real world repercussions, too - easier to get ripped off at the supermarket if you can't work out how much change you ought to have been given, for example. With English there's this set who are making excuses for the laziness, by calling those of us who are putting in the effort "pedants".
If caring makes me a pedant, then I guess I just have to wear my pedant badge proudly. Because I do care. It kills me that I take the time to have pride in my written expression, that I truly believe that most people (those without genuine learning disabilities, that is) could also attain a superior level of written communication if they just bloody try - I have faith in and expect the best from my fellow human beings, no matter how naive that makes me - and the person in this equation being ridiculed isn't the lazy ones not bothering to try, it's me, because I'm a pedant.
For the record, I never for a moment intended to criticize or bag out people who genuinely struggle - my mother is dyslexic, and she tries, and she tries, but she makes a lot of mistakes. But for me, that's the difference. She isn't pooh-poohing correct spelling and saying she can't be bothered. As I said before, those are the ones that bother me.