Ok but the apostrophe is backwards. It should be ’24, not ‘24. It's a very common mistake (probably thanks to MS Word's "smart" quotes) but it still bothers me.
Afaik, it is grammatically correct as not is negating make. To me, "let's not make this weird" implies it isn't weird and they are trying to keep it that way. While "let's make this not weird" implies it is weird atm and they are trying to undo that