best short answer i can give is, remember in the old days not today , please !) when you were, say only 5 or 6 years old,
a kid in kindergarten, and you might have had a small little crush (liking for ) on , say, your kindagarten teacher,
and she just smiled it off ? ...... she found it interesting , but nothing more ?
and in a way she kinda liked you for that ? , you became teacher's pet ?
well it's something like that .....this is not a literal parallel, but something like that
but, but , but , .... if an older man smiled at her , ....that would be v different ?
well if women smile at me , it's like the older man - i mean this could be potentially serious
and seriously good too ! yummy !
but a man smiling at me - it's like the kinda(garten)-kid !
clearer now ?