Don't bite the hand that feeds you

to " bite the hand that feeds you" means to be "unkind or disloyal to sb who has been kind or be helpful to you, or pays your wages."

Eg. When you say such nasty things about the organization, you're biting the hand that feeds you.

get on my nerves

To get on someone's nerves means to make someone annoyed or bad-tempered.
eg. That music gets on my nerves.