Mojo and mcfarm both have idiosyncrasies about Donald Trump. One can see no good, and the other can see no bad. The trouble is most of the Forumites agree.
https://en.wikipedia.org/wiki/Idiosyncrasy
An idiosyncrasy is an unusual feature of a person (though there are also other uses, see below). It can also mean an odd habit. The term is often used to express eccentricity or peculiarity.[1][2] A synonym may be "quirk".