For the sake of argument, A cockroach is more "highly" evolved than an ameobia but arguably a human is more "highly" evolved than a cockroach. This is not a mainstream scientific view as it equates the "complexity" of an organism and its relationship to the environment as a measure of evolutionary "progress". Pretty sure this attitude fell out of favour in the early to mid twentieth century if it held sway amongst scientists at all.
The question of whether something is more highly evolved is imported from non-scientific ideas concerning ideologies of social status amongst humans and applying them to the natural world. It's a consequence of social Darwinism and not of the understanding of evolution in a narrowly and rigourously scientific method. Eugenics would equate wealth and social status as biological (e.g. A rich man is more highly evolved than a poor man, a race that successfully colonises large parts of the world is superior to the race it has conquered and colonised, etc.) such concepts have limited scientific value unless you can assert there is an objective measure to evaluate them which is why (I think) the idea is widely discredited as we can't claim that.
The question of whether something is more highly evolved is imported from non-scientific ideas concerning ideologies of social status amongst humans and applying them to the natural world. It's a consequence of social Darwinism and not of the understanding of evolution in a narrowly and rigourously scientific method. Eugenics would equate wealth and social status as biological (e.g. A rich man is more highly evolved than a poor man, a race that successfully colonises large parts of the world is superior to the race it has conquered and colonised, etc.) such concepts have limited scientific value unless you can assert there is an objective measure to evaluate them which is why (I think) the idea is widely discredited as we can't claim that.