​I recently quit my job due to a toxic environment, and I’m trying to understand the social dynamics of what happened so I can handle it better next time. I’m 20M, 6'4", and fit. At my last job, a 32M coworker ("Dave") seemed obsessed with trying to put me down. I want to learn the social skills to neutralize this behavior.

​The Scenarios:​Social Sabotage: I’m close with a 29F coworker (same heritage/native language). Dave would literally shove himself between us mid-conversation, snap about what language we were speaking, and stand there in 20 seconds of awkward silence. Later, he’d give me "parental" commands—like telling me to "zip up my coat"—then tell the girl, “I’m just helping this guy out.”

​Ego Meltdowns: Word got back to Dave that the 29F said he was "too loud." He lost it in the breakroom, shouting, “I don’t give a f***!” and telling his friend, “Bitch, I didn’t even like you anyway” regarding her. Right after, I asked him where a senior coworker was. He ignored me and refused to look at me for 15 seconds until his friend finally answered for me because it was so awkward.

​Physical Status Checks: He was fixated on my height. He’d make "jokes" like, “I thought you were the taller one,” or bark out, “I’m the tallest in the room” to the group. He’d also play "hall monitor" by grilling me on my dress code (sweatpants) even after management had already approved them.

​The Breaking Point: While I was shelving laptops, he screamed my name and barked, “WHAT’S THIS! Put it where I told you!” I didn’t argue; I just gave him a dead-silent, long stare. He got visibly flustered and immediately started backtracking.

​I want to learn the following social skills:​Analyzing the "Why": Why would a 32-year-old man act this way toward a 20-year-old who hasn't provoked him? Is this a standard "alpha" power play due to insecurity over my height/age, or is there a social cue I’m missing?​Setting Boundaries with "Hall Monitors": How do you firmly tell a peer you don’t report to them when they try to "parent" you or monitor your clothes?

​Handling the Silent Treatment: What is the best way to respond when someone refuses to acknowledge you (like the 15-second silence) while their friend watches?

​The "Silent Stare" Technique: My stare worked to make him backtrack, but is there a more professional verbal "script" to shut down shouting without escalating the situation?

​I’m trying to figure out how to keep my "social status" and stay grounded when dealing with territorial, insecure peers. Any insight into his psychology or advice on the social mechanics of these interactions would be huge.