why does Baptista tell his daughter he doesn't blame her for crying on her wedding day?

"Go, girl. I cannot blame thee now to weep,

For such an injury would vex a very saint,

Much more a shrew of thy impatient humor."

Baptista doesn't blame her for weeping because he feels she has been grossly insulted. He infers that even a saint would be upset by such a blatant insult, and that he understands that a shrew (like his daughter) would be doubly upset.