Kids can learn to be quiet. Maybe libraries don’t need whisper voices anymore, but inside voices for sure. Teaching kids (and adults it seems) to respect a public space and the people who are using it is not kid hostile. Sharing a space means all sides have to compromise and get along.
I honestly cannot tell if anyone is flirting with me or not. I also cannot imagine that anyone would flirt with me in the first place, but if anyone did, I still wouldn’t know. The only flirting I knew was when my wife called me up and lectured me for not asking her out. Apparently, she had been flirting with me and I didn’t know. I am not bright.