When interviewing for a job, you want your employer to know that you can work well with other people and handle conflicts in a mature and effective way, rather than badmouthing your coworkers or talking about other people's incompetence.
When you're asked hard questions, like "Tell me about a time that you didn't work well with a supervisor. What was the outcome and how would you have changed the outcome?" or "Have you worked with someone you didn't like? If so, how did you handle it?," don't fall back on badmouthing other people. Instead, review how to answer difficult questions.
Brush up on more interview questions and answers before your interview.
Then take a look at what to do if you've blown a job interview for your dream job and want to try to get back into consideration.