-FZRA might be "ok" according to some carrier's Ops manuals, that is if exposure isn't prolonged or the intensity doesn't increase.
And there lies the problem in my opinion.
The weather reports, (ATIS, TAFS etc..) can all report "lite" freezing rain, but that is no assurance that the situation won't worsen by the time you are on approach or attempt to takeoff.
I've been in reported "lite" freezing rain on the approach, and by the time we landed and taxied to the ramp both the protected and unprotected parts of the plane had a solid coat of ice.
Fortunately the exposure was only for the last 10 miles of the approach, but I remember thinking no way that was "lite.
I was also slipping on the ramp doing the post flight. (No snow at all, just a wet icy coat on the ground)
Long story short, asses the conditions yourself regardless of the reports.