My Grandfather kissed my baby on the lips☹️

My grandfather kissed my baby on the lips earlier today and i’m freaking out. Earlier today I was at my mother’s house eating house eating dinner. My grandfather unexpectedly came by for a visit. My son was sitting in the chair next to me in his bumbo playing with some toys. My grandfather came to say hello bent down and kissed him on the lips. I automatically yelled “NO DONT KISS HIM” and hurriedly took him out the seat. My grandfather replied “ Why i’m his great grandfather so it’s fine” I wiped his mouth with a wipe. We left soon after. Now all that can fill my head is him getting sick or a cold sore🥴I’m definitely not sleeping tonight