I know "Humans are Space Orcs" is a popular trope, but here's one that doesn't get as much mileage.
Aliens reacting to our wildlife.
Because, god, if they think we're Space Orcs, wait until they see the shit that could scare or amaze us.
Alien: "Human, I was looking over my notes..."
Alien: "Your closest living ancestors are of the genus Pan, yes? These "Chimpanzee" and "Bonobo" creatures."
Human: "Uh, yeah. Funny story, they wouldn't be living nowadays if it wasn't for NATO signing the ENCR Preservation Act-"
Alien: "In 2031, yes, I know, that's not what gets me. What gets me is, uh...I was unaware your empathy and barbarism was genetic. Chimpanzees enter into societies and build tools, yet also cannibalize weaker factions and have "hair-trigger" tempers."
Human: "Yeah, Chimps are fucking terrifying."
Alien: "...They're what?"
Human: "They're...fucking terrifying?"
Alien: "They scare you?!"
Human: "Why wouldn't they? They have super-strength and sharp teeth, not to mention the grey matter. Piss off a Chimp and you could, literally, lose your face."
Alien: "YOUR KIND ROUTINELY BUILDS SUPERWEAPONS AND INGESTS POISON FOR FUN, AND YOU'RE SCARED OF YOUR PRE-SAPIENT RELATIVES?!"
Human: "Wait 'til you find out how we feel about bears!"
Alien: "HOW YOU FEEL ABOUT WHATS?!"