When LeBron joined the Heat, he and Wade attempted to have #23 retired league-wide, since they couldn't both wear it on the Heat.
When AD came to LA, Lebron offered to give #23 to AD. Later, deferring to Nike (and others?), giving #23 to AD was delayed until after the season because there was so much LeBron #23 merchandise in the sales channels.
This was the perfect opportunity for LeBron to make good on his offer to AD, and honor Jordan, but he did not take advantage of either opportunity. AD has, no doubt, noticed.