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.)
My friend and I used to wear BDUs and we sewed a bunch of patches on. We were like 12 or 13. This kid confronted us one time with that stolen valor bullshit. We were like "yo we are children, nobody is gonna think we were in the service." He kept going so we offered to beat his ass and he fucked off. Still laugh about that.
But man those old BDU pants were great for hiking. All those deep pockets and lots of leg room plus you could actually sew them up with a patch or use a denim iron-on.
All that said, a grown ass man in fatigues sets off a few alarm bells.