To me, the flirt notion can be a slippery slope into one of two directions.
Basic friendliness with other gender, a smile, some eye contact, basic greetings, seems fine.
Overly friendly behavior, can be slippery for some, and travel path to grass is greener other side of fence behavior, sure. Not everyone travels that.
Then there's the path, to jealous behavior, for basic friendly behavior. I had to look down from men, lest wanted tirade at home. Why can one not treat men and women, the same?

So, to me, it lacks concrete definitions. I have other deal breakers, than being friendly to opposite gender.

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