If you step/tread on someone's toes, you say or do something that upsets or annoys that person, especially by involving yourself in matters that are not your responsibility.

What does treading on your toes mean?

Definition of tread on the toes of (someone)

: to do something that upsets or offends (someone) You might tread on the toes of some important people with this project.

What does i dont step on toes mean?

to upset someone, esp. by getting involved in something that is that person's responsibility: It's a very competitive business – you can't afford to step on too many toes.