Very short version of the long argument.

[TheBeardedDude]

There is no highest possible goodness, it is fantasy.

Very short argument.

Denying the conclusion in an argument is a sign that person has nothing to say regarding the actual argument.

This isn't a logical conclusion from your "argument." It is an assumption that takes an abstract concept ("goodness") and defines it as an objective concept, then defines it as an objective concept that exists on a gradient where one end is maximized "goodness" but there is no demonstration of:
1) goodness objectively existing
2) goodness existing on a spectrum
3) maximum goodness being a real thing (for instance, infinity is a mathematical concept but doesn't actually mean that infinity is realistic)