Regardless of what cultural category may or may not apply, I find that line of thought rather unconstructive. This isn't about being anyone's opinion on suicide like some black and white binary stance whether you're "for" or "against". This is about coming to terms with your own mortality.
It's about the grey area in-between the extremes of committing suicide (the "black"), and forever running away from risk so that you can die of cancer while undergoing chemotherapy and getting your diapers changed in an elderly home (the "white"(?)).
And if even discussing the topic in those terms touches on some kind of taboo, then yes; perhaps you're right to emphasize the cultural component involved.
In the past, suicide was viewed as immoral and criminal. We have moved past that, not because suicide is more socially acceptable, but because of a desire to more easily help people suffering from mental illness.