Which detail best shows Prince Henry's feelings about Poins?

PRINCE HENRY: Belike then my appetite was not princely got; for,

(10) by my troth, I do now remember the poor creature,

small beer. But, indeed, these humble
considerations make me out of love with my
greatness. What a disgrace is it to me to remember
thy name! or to know thy face to-morrow! or to

(15) take note how many pair of silk stockings thou

hast, viz. these, and those that were thy

peach-coloured ones! or to bear the inventory of thy

shirts, as, one for superfluity, and another for
use! But that the tennis-court-keeper knows better
(20) than I; for it is a low ebb of linen with thee when
thou keepest not racket there; as thou hast not done

a great while,

The detail that best shows Prince Henry's feelings about Poins is But that the tennis court keeper knows better (20) than I; for it is a low ebb of linen with thee when thou keepest not racket there; as thou hast not done a great while,

What is a Feeling?

This refers to the emotion that a person feels about a particular person or thing that can influence their actions.

Hence, we can see that Prince Harry had the feeling of mistrust and loathing for Poins who was the tennis court keeper because he had better knowledge about racquets.