You might be responsible for creating the only environment in which they are talked to in a respectful way, as a mature developing adult, on equal par to you in terms of dignity.
Stay Polite And Respectful (Be The Perfume)
You’re Not There To Be Liked
The boundaries you're uncomfortable enforcing are the very same ones that they NEED because the chances are, they aren't getting them elsewhere from the other people in their lives.
Decide What You Value
If you don't decide the values you stand for, you're never going to achieve coherence in anything, let alone behaviour.
AVAIS QURESHI 