To address your points:
1) More revisionist talk…No one has ever said that once you have a PSAK DIN on a matter of halacha, you can blithely ignore it.
In that case we are in agreement on this point.
2) You ARE making them “infallible” when you say that you cannot discuss ‘shortcomings” of Rabbonim.
Not at all. I am saying that aside from general loshon hora problems, there are the added issurim of being mezalzel talmedei chachomim. This is even when the gadol in question has actually done something wrong as acknowledged by other rabonim. If you decide on your own he has done something wrong, that is a huge chutzpa.
3) R’Moshe zz’l was castigated by many a Rov and baal habayis even on his Piskei halacha!
4) Must I check my own intelligence and “shikul hadaas” at the door when I speak to a godol?
5) This attitude of ’emunas chachomim” is of very recent vintage and is totally in contradiction to past centuries.
6) BTW, your example of Rav Yehoshua is totally besides the point. Rabbon Gamliel was acting as NOSSIH when he ordered Rav Yehoshua to come to him on “his’ Yom Kippur.
If we are in agreement on point #1 there is no need to discuss this further.
7) Did you say the same when they besmirched the Lubavitcher rebbe zz’l and all his chassidim when a godol (whom I shall not name here) said you cannot be “meshadech’ with them?
8) Do you say the same when some chareidim continue to insult and vilify the memory of Rav Kook zz’l?
9) Do you say the same when some bnai yeshiva keep on referring to Rav Soloveichik as J.B.?
10) Do you say the same when some in the oilam hayeshivos continually deride chassidim of all kind?
One additional point:
His comments, however, had nothing to do with psak and everything to do with opinion.
The reason gedolim who learn the same torah shebiksav and torah shebal peh have different conclusions as to the halacha is because they are basing their psak on their differing opinions of the correct interpretation.