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.)
A fash dude in person tried to get into a group I was organizing with. We went on a day there, day back roadtrip with him before we really knew him and by the end of it we cut him out completely.
Two biggest red flags were:
It didn't take long for the full fash ideology to be on display and as soon as we dropped him off we blocked him on everything and never looked back.
When a chud says that, what they mean is they look forward to it.
Or they are fear mongering with the intent to sway opinion that societal collapse is imminent so that we all must be ready to use extreme measures.
"Societal collapse" in their mind is the collapse of their privileged life. "Extreme measures" meaning find ways to quietly genocide a group of people before it becomes an open power struggle.
Every time a hurricane hits hard enough, chuds are eager to "defend" against "looters."
finding
looting