Wanhao wasn't angered by Smith's words, because Smith was indeed speaking the truth. The cause of this incident was indeed due to The Grudge between Sheila hotel and Grand Duke Ryan.
If it wasn't for The Grudge between the Sheila family and Lai en, Zhao Hai wouldn't have become enemies with Lai en. If Zhao Hai didn't become enemies with Lai en, Lai en wouldn't have chased after Zhao Hai all over the world. He wouldn't have thought of such a trick to deal with Zhao Hai.
Hence, Wanhao was in full agreement with Smith's words. Besides, there were only benefits and no disadvantages to working with Smith and the others this time around. It did not matter if he lowered his voice a little. In the end, this was the difference between merchants and old-time aristocrats.