How have you told relatives to stop kissing your baby on the face?

I’m fine telling my parents but my husbands step dad gets butt hurt about everything and now I work for him and don’t want to deal with an attitude after if I tell him to stop kissing him. He always feeds him too and I try to stop it,(he’s 7 months) I’m just getting so much anxiety every time he kisses him and bits off a piece of food for him 😣 I don’t even kiss my baby on the lips. It drives me crazy but my husband said he doesn’t know how to say anything to him.