Why do people get mad?

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So I have my little new born baby and you know people want to visit and hold him but before they do I make them go wash their hands put sanitizer make sure they don't have cologne or perfume on if you got it on to bad your not holding my baby sorry. I tell them not to kiss his hands feet or head don't kiss him at all. Like than they look at me like if in crazy or rude. But if you don't do this than idk what your doing cause my baby is precious and he's not gonna get anywhere near sick. Even I before I change his diaper put hand sanitizer and after