I've recently dealt with an issue where a personal trainer tried to take advantage of me by working out with his friends during our slotted time. I went straight to the manager and told him to give me a different trainer or I'm quitting. Instead, he sent the trainer back to me without clarifying what was happening. And the PT showed obvious signs of being angered and flustered: giving non-apologies, slamming weight plates, changing the workout, and rude "encouragement." I quickly ended the session and tried to distance myself - he followed so I asked for the manager again. Seeing as how the manager even seemed hesitant to speak with me away from the PT, showed me he wasn't on my side. And now, I'm working to get my money back and avoiding this gym chain.

I reflect on what had happened and I believe a lot of people make an instinctive calculation and decide what they can get away with. His extreme reaction being the result of his realization he had made an error. But I've been through this several times in my life. A coworker stealing my stuff and attacking me from behind after I confront him, resulting in me becoming a ostracized. A subordinate threatening to assault me, resulting in both of us being fired.

The common denominator is me. I can tell myself I can stand up for myself and I have. But there must be something about the way I carry myself and interact with these people that make them think they can take it too far. My coworker could have stolen from others but he chose me. I would rather the situation not escalate at all because when it does, the "manager" for my scenarios take the easy wrong over the harder right and side against me. And it ends up feeling like I need to avoid groups or places ie-the kid of the guy who threatened me going to the same BJJ as me, so I quit.

I've been listening to psalms while working out. Are there any passages that could help shed light on mitigating this kind of situation?