Usually it doesnt come up in a conversation, you just know.
Most such people you will come into contact fall in the following categories
R’L Close friends and family. I know a few frum people in that circumstance and I am not going to touch it
A co-worker. If you say ANYTHING, you can either be reprimanted or fired. Most companies have policies that prevent you from saying or doing anything (and they cannot say anything to you either)
A potential client. If you say anything, they will just take their business elsewhere. do what you want, there is nothing illegal for them to take their business elsewhere