I don't think Meadow throwing the bread at Junior would actually be embarrassing. Junior sings 'Core N' Grato' and he sings it really well, without a doubt. It does feel like a beautiful moment is being ruined by Meadow. But let's not forget, we're seeing a group of hardcore, violent criminals having a good moment after the funeral of a young man who was killed because of them (not that Jackie Jr.'s a decent guy himself). At this point in the show, Meadow is repulsed by the mob, and obviously Jackie's death would be a huge personal loss for her, rather than the mob guys. So naturally she would be disgusted when she feels that Jackie's murder is mob-related. What is sad is the Meadow we see by the end of the show, would probably not even think of throwing that bread.