Any sign of negativity - complaining about your prior job, or worse, the people there, is a huge red flag in an interview. They don't know you, so they only can assume it's as likely you were the problem.

Interviews are, fundamentally, sales propositions. You shouldn't outright lie, but you don't need to focus on the negative things either. People on the spectrum (as many engineers tend to be...) find this kind of stuff very hard. But for most people, it's fairly normal to sugar coat things to keep the social machinery flowing. It took me a long time to learn this.