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.)
Being too intensely interested in football.
Football is a popular working class pastime, a great way to get exercise and a great way to socialise as a player or as a fan. Literal billions enjoy football worldwide and there's nothing wrong about that.
But then there's the kind of guy who is so much into football that he makes it a defining part of his personality. These kind of guys are more likely than not to be aggressive and nasty chuds.
Reminds me of the brother in Get Out who monologues about it.
Football guy/girl is like an archetype in every European social circle.
Americans do this with American football too
90% of Eastern European football-obsessed fans are fascists.
I think this is called sublimation. "I, the petite bourgeois / labor aristocrat who benefits from capitalism but is still humiliated by the fact that I am not a billionaire and never will be no matter what I do, must pour my rage at the system in some other direction, since destroying the system will, at the very least, temporarily inconvenience me."
I agree that being into football in a certain way just screams "i like getting into fights", but depending on the club that may also mean "i like to punch nazis every weekend".