Apart from the matter of usury, why does Shylock bear such hatred for Antonio in Shakespeare's The Merchant of Venice?

The answer posted January 9, "The hatred is mutual," might
help one to understand why Portia's "The quality of mercy" speech is regarded as the
keynote, so to speak, in the play.  One might also note that each of three occurrences
of the word "hate"  in Shylock's speech is linked to passages in ROMEO AND JULIET.  The
first, "I hate........but more," is linked to Romeo's "Here's much to do with hate, but
more with love"(ROM1.1).  The second, "But yet I'll go in hate"(MV2.5), is linked to Act
1, scene 4 in ROMEO as both Romeo and Shylock express misgivings about going to the
respective social gatherings.  The third, Shylock's "lodged hate"(4.1), is linked to to
Romeo's "As if that name" speech(ROM3.3).  Therefore yet another love triangle, Shylock,
Leah and Antonio is suggested.