a) Practice talking about that situation until it no longer triggers anger/resentment. No employer wants to hear an impassioned rant about how horrible your last job was.

b) Be as specific as possible when talking about the challenges of the last job and what you attempted to do about it. If you just say "toxic environment", "bad culture" or "menial work" or whatever, that could make it look like you're super negative.

When I was interviewing while in a pretty bad job, a way I framed it was:

"I wanted to do [explain project and rationale] and took initiative in that direction, but [person with authority] obstructed me by [what they did] and that made me like I was in a culture that [negative characteristic of culture], while I value [positive characteristic of culture], so I don't believe I'm in the right place anymore. This was an example to illustrate this, but I could dig deeper and share more if you want me to."

-> This keeps it free of judgment/resentment while also being assertive about what you want. It also frames you in a position of agency, not victimhood (you're not escaping something horrible, but proactively finding a better fit). It also shows your values in a specific (believable) way, not the typical job interview talk.