Dealing with parents feeding LO

How do you deal with ur own parents respectfully in feeding LO something they shouldn’t be eating? My LO is coming 7 mths and my parent let him lick and taste chocolate. Though I think that quick taste shouldn’t impact LO’s health but I was quite surprise they actually did it. When we go out for dinner, sometimes they will also let LO to lick on some food for fun, like bread, porridge and buns...