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.)
grew up in and around nondenominational churches and wow. some of those people are just a simmering pot of wild takes and beliefs. luckily we made it out but man. it's a black hole.
Yeah, I grew up Catholic, but family were Non-dom and if someone says their Trad its just "I'm a gigantic Fascist who thinks Franco is the coolest"
But "Non-denominational" had just enough non chuds in the description that it could be a group of Christian Anarchists or some Jesuit who got defrocked for taking ecumenicalism too far or some weird descendent of the Diggers. But it wont be, it'll be Hillsong or people more fash than Hillsong.