It's the proper way of measuring. Many guys want to use the side or bottom measurement because it's a bigger number. But that isn't the real measurement! Remember that dildo pic I showed as a guide? Here's the same dildo measured incorrectly
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Instant "10(9.5) whatever" inch dildo! Yes a side measurement can vary THAT wildly! Underneath can measure all the way to a guy's anus for all we could tell. But men take those underneath and side measurements and use them as their claims, which messes with men who measure correctly. When challenged the same men who measure incorrectly get upset. Some lash out, say that we are being haters (we really aren't, at least I'm not) just trying to correct the craziness. Overall what will happen is most will realize they still have a big dick, its just not that crazy high number which is so super rare.
Okay enough rambling from me.