How to say no kissing baby without it being awkward

I don't feel comfortable people kissing my baby, I've told people this and so many people have 'accidentally' done it 🫣 we went to a friends house and was having a nice time, had a really lovely chat with an older woman and when she said bye, she gave him lots of little kisses on his head! I'm really struggling with my mental health and anxiety post partum and didnt say anything. On the drive home, I tried to be ok with it but now I feel ao upset. I'm annoyed at myself too. I just find it so awkward that everywhere I go i have to say 'no kissing please' (I'm a recovering people pleaser lol)!. Anyone got any advice?