Zhang San knew that attending Qiao Tu's birthday party, this guy would definitely throw some shade at him.
Some media outlets have calculated the endorsement fees Jordan received during his time as a spokesperson, totaling $82.5 million, which isn't even as much as the contract Zhang Yang just completed for renewal... Jordan's endorsement contract signed in '84 was for 5 years at $2.5 million, and when renewed in '89, it was 4.5% of stock options plus an annual lifelong contract averaging tens of millions.
When AJ became independent in '97, Jordan directly received dividends, getting several tens of millions in the first year; a few millions in the late '80s are not less than $25 million today; back then, the second-highest shoe endorsement fee was Big Bird's, which was only $3 million... Zhang San knew Qiao Tu wouldn't care about these facts, and indeed Qiao Tu didn't care, just threw shade.