I'm guessing "being a sedevacantist" doesn't count anymore... but five years ago (and definitely ten) the quickest way for me to be unwelcome in trad circles was to mention I don't think Paul VI and his successors were popes. Seems to be pretty en vogue these days though.
I think cannabis products are morally lawful to use according to the same principles that make alcohol morally lawful to use.
I think that for the most part prepping culture is a completely manufactured commodities industry and that it's in the business of selling a sense of spiritual superiority (I distinguish between people are prepped and people who are preppers... everyone should be ready to endure a three month period of having to completely fend for themselves, I'm 100% supportive of that).
I think all student debt should be completely and unconditionally forgiven.
I think that the trad "ideal" of having a homestead on acreage in a rural area has rendered traditional Catholics politically inert and socially ineffective.