New assistant manager?

I’m a new assistant manager, I’m not well liked. I’ve learned a lot during this experience but, I’d love to fix things. I’ve been told, I don’t sound confident, and I’ve also heard complaints I’m rude.
For those of you who have ever disliked a manager or leader in any position and chose to show a lack of respect for them, what are some things you didn’t like about those managers.
What are some quality’s about them you’d change?
New assistant manager?
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