DY – it’s pretty obvious that the thread is making fun of certain practices, which I also agree aren’t mainstream frum, but bringing Reb Moshe into it as part of a joke isn’t respectful.
Talking about the GRA in the inyan of the Goral HaGra is relevant if it’s done respectfully.
However, I still think it’s not right to ridicule people. I think certain groups are way off the mark in terms of some of their beliefs and minhagim, but ridiculing people isn’t a very effective form of tochacha.