This is a little bit tricky to answer (könnte man sagen, die Antwort ist verwickelt). Why? First, we have to agree on the meaning of the expression. I'll assume that the expression means "to offend someone by doing something that interferes with their responsibilities". The tricky part is that this expression is mostly used in cases where you're just doing something that, without you wanting to, interferes more or less with someone else's responsibilities and ends up offending them. Normally, you don't have the intention of offending someone or disrespecting anyone, but they take it as an offense nonetheless. So in that case I would use: "herir susceptibilidades de alguien" o "pasar por encima (de la autoridad) de alguien". For example: "If you publish this document, you'll be stepping on the general manager's toes." So this can be translated as: "Si publicas este documento, vas a herir las susceptibilidades del gerente general." O, podrías decirlo así también: "Si publicas este documento, el gerente general puede pensar que quieres pasarte por encima de su autoridad." o podrías simplemente decir ".... puede pensar que quieres pasarte por encima de él." I mentioned that it's tricky, because if you try to translate "offend" to German, you'll most likely encounter words as "beleidigen", but as I said, it's not so much that you want to "beleidigen" someone (which would mean more "to insult" someone), but that you're doing something that a person, usually with a certain authority, may see your actions as threatening and offensive, even if they're not. This happens a lot in the consulting field, where consultants are there precisely to look for areas of improvement, but their findings may be threatening to some employees, even if they are not meant to be threatening. Ich hoffe diese Erklärung hat dir geholfen, und dich nicht mehr verwirrt hat ha ha ha. Tschüss!

lo único que se me ocurre es "creerse el jefe (de todos)."

Entrometerse con alguien

Creo que el modismo más acertado sería "meterse en donde no lo llaman"