First off, "two is objectively larger" is silly. If you're comparing two to one, then there's subjectivity involved. Rather, your argument is like saying two is objectively large, period. That's something that you can't do.
But humor isn't as harshly defined as the number system is. Rather, defining humor like that would be like saying "the sound of the word 'two' is objectively greater than the sound of the word 'one'." Once you say that, you need to define what those sounds actually mean, determine the numeric value of each, and then make the comparison. Until you do all those things - and all of those things require subjectivity within the confines of a language - then the sound of the word "two" has no meaning. The concept of two is objective, because mathematics deals only with objectivity. But humor doesn't have such harsh definitions, none of it is objective, and you can't limit it in a way that makes it objective.
But humor isn't as harshly defined as the number system is. Rather, defining humor like that would be like saying "the sound of the word 'two' is objectively greater than the sound of the word 'one'." Once you say that, you need to define what those sounds actually mean, determine the numeric value of each, and then make the comparison. Until you do all those things - and all of those things require subjectivity within the confines of a language - then the sound of the word "two" has no meaning. The concept of two is objective, because mathematics deals only with objectivity. But humor doesn't have such harsh definitions, none of it is objective, and you can't limit it in a way that makes it objective.