I have no tats and I don't recall ever having my hair molested, but I couldn't believe how many people thought it might be cool to pat my pregnant belly when I carried my chicks. I'm not a touchy person by nature (only with those I'm close to) and I hated it. If you're a very little kid and would like to pat the baby, yes fine. If you're over 80, I'll indulge you. Otherwise, back off.
My other pet peeve was having strangers 'mommy or momma' me. I'm not your momma.
Listen to me. I'm in my 40s and I've already turned the corner on crabby old lady.