Trust me, as a regular poster on Fish Eaters, there is nothing to be concerned about. You may see certain viewpoints you disagree with among the posters (sedevacantists, although these are rare, and sede discussions are only allowed in one subforum, SSPX supporters, etc). It’s a place for people who attend diocesan, indult, FSSP, ICK, etc Masses, all within diocesan borders, who believe Francis is the Pope, etc. If other people have other opinions or worship outside of diocesan structures, they are allowed to post and are treated hospitably, just like various groups are on this forum.
As for a “contemptuous” attitude to anything after 1962, this isn’t the case. These are people who are often desperate to simply worship the way Catholics worshipped for many, many years and are not able to attend the Mass they prefer because it’s not offered anywhere near their location (which is my case, currently). They’re people who are trying to raise many children in the Faith and keep it instilled with them among clergy who want to tell the world that there are many salvific paths or other errors. They are simply trying to be Catholics. And the people I have met on Fish Eaters are among the most holy, orthodox, and devout I have ever met.