For me the easiest tell is the up front, unprompted, and unsolicited declaration of nonpoliticalness. When someone takes the time and expends the breath to announce how nonpolitical they are, what follows is almost always a rant about how everything/everyone else is too political these days, and that of course leads into something between status quo advocacy and outright reactionary/regressive sentiments for some fabled time before those wicked politics were visible to the nonpolitical ranter. 
People that are hostile to service workers. Some just want to take some ideological stand against tipping when the service worker doesn't really have a choice and needs those tips to survive in the current unjust system in a way where ideological purity gestures toward that service worker just look like being a greedy and sanctimonious asshole. The worst of such people will actually declare, shamelessly, that they believe that service workers don't deserve a living wage. The implications of that are 
worthy.
I may get shit for this, but I'll say it anyway: this hair and beard combo, seen on living people. 
I have yet to meet anyone in person with that look that wasn't a chud.
(If one of you is a comrade with that look, I am sorry in advance for the prejudice and if I ever meet you in person I will atone by buying you a drink or something.)
Oh and all symbols of nationalism that need to be underlined, flags and stuff.
And anyone saying "it's a defensive alliance" or "it's our only choice".
Adding:
Fatmisia or any kind of worship of intense fitness or clean eating culture.
Notions of health that are very much full of "if they just made better individual choices". Seeing health as a result of individual "good choices".
Making remarks of poor people that underline a lack of education/choices.
Larping with homesteading or other self-reliance stuff from a point of high privilege.
Explaining things like anti-vaxxers or trump-voters with misantrophic notions of poor people.
Overpopulation, any hint of it as an idea.
Saving the nature, as in just caring about the nature-part.