Guys can never tell if a girl is just being nice or flirting but if it's flipped around can girls?

Most guys can't tell when a girl is being flirty or is just be nice, it'll be something that plagues us till we die.

But I'm wondering, can girls tell when a guy is just being nice or if he's flirting with you? Do you think you mistake some things that are meant to be flirty as him just trying to be nice or vice versa.

And I'm not talking about when a guy comes up to you at the bar and says "you're looking good tonight...can I have your number", maybe an example is if its your birthday and a male friend says he wants to take you out at some point for a birthday dinner.
Guys can never tell if a girl is just being nice or flirting but if it's flipped around can girls?
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