Is my boyfriend rude or just blunt?

classy-girl
My boyfriend is a brutallly honest person. Last week he met my family for the first time, told my mom that her cooking wasn't good, told my sister that her degree in women and gender studies is worthless and my brother to shave his bread beacause it looks aweful. My grandpa is a very religious person and he started having a huge debate. How can I ask him to tone it down few notches?
Is my boyfriend rude or just blunt?
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