haha, it is funny

OK, then let's be serious.

1st, the definitions of 好色 are different.
It is very obvious that 楚王 didn't care about your definition.

That is the point of this article--登徒子好色賦.

楚王 didn't care if 宋玉 had a high taste or low taste of beauty. He only cared if 宋玉 would seduce his women or would be seduced by his women.

宋玉 proved that he had a reputation he could resist women's seduction.
On the contrary, he thought 登徒子 didn't have this moral.

2nd, your defintion said that 宋玉 have a higher taste, I believe you are right. No one can deny your point.

But, what is wrong if a man have a good sense of beauty?

3nd, having a high taste or low taste doesn't make one
safe or not to seduce others' wife.

宋玉 was not perfect on this argument, but 登徒子 was also wrong. 宋玉 made a good defense to 楚王, that is most important for him.