If it wasn't for the fact that she had sufficient evidence, Chen Meng'er wouldn't have dared speak in such a manner in front of this person. Even though Chen Meng'er wasn't afraid of him at all, he was the person in power in this country after all. If she really provoked him, it wouldn't be a good thing for Chen Meng'er.
However, similarly, if it was not a last resort, this person would not think of offending Chen Meng'er. Chen Meng'er had the Green Gang, Liu family, and Qu family behind her. If they were to really fight it out, it was really impossible to determine who would win or lose. Moreover, it was not a wise thing for him to oppose Chen Meng'er.