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.)
IME this is code for "you're about to hear that Catholics are all cryptopagans, also I don't know what an Orthodox Christian is but if I did they'd be a cryptopagan too."
Oh man some of these guys think Lutherans and Presbyterians are cryptopagans.
"Why can't they just call themselves Christians?"
More "Arminianism isn't nearly depressing enough a theology for us we need full Hypercalvinism to justify our prosperity gospel."
(I think maybe my recent posts are a bit hard on moderate Reformed (ie, Cavinist) Churches who despite my disagreements have often lead left wing movements. But much like Tradcaths these fuckers aren't helping.)
what the fuck is a cryptopagan
When I was a kid, my non-denominational (and/or evangelical, depending on the week) mother used to tell me that really Catholics were pagans because they prayed to saints, which is polytheism.