Perma-bears and perma-bulls. Both are pretty much useless (but like a stopped clock will be right from time-to-time. Though, to be fair to stopped (analog) clocks, at least they get it right twice a day).
I have a new term that can be applied to both the perma-bulls and perma-bears … it involves getting rid of the 7th to 9th letters (inclusive); i.e. the “ull” and the “ear”. Doing so leaves one with the expression “perma-bs”. I think that is appropriate.