Ether does allow grinard regent to protonate .
L.p of O is in conjugation with Ph so partial positive charge appear on O atom which greatly reduces delta (+) on Me .Therefore grinand can't attack Me
I think it can still attack the sp hybridised carbon.
This attack will not interfere with resonance and also sp has 50% s character so can greatly stabilise a negative charge.
Its not about interfering resonance its about driving force, delta (+) on C atom is very weak and grignard is not very strong nucleophile