Because the people making snide comments about someone who is 5 times their age most likely never cracked open a halacha sefer and have no idea of how to learn aliba dihilchasa.
I'm not getting into the specifics of that case exactly for that reason. Because I am not qualified to have a part in that discussion. For some reason, a bunch of young shnooks think they do have a right to be Mevaze Talmidei Chachuchim.
What you write is sickening and factually wrong. Many of the people that took issue with the above referenced psak are talmidei chachamim of great stature and aren't young either.
Taking a swipe and being מוציא שם רע on a community of tens of thousands of people including thousands of תלמידי חכמים amongst them many who are well versed in הלכה is abhorrent and is שנאת חנם, not something anyone should ever be peddling and definitely not this time of year.