I inject and test wherever I am. If I am with someone who I don't know I ask them if they have a phobia of needles as I don't need people fainting everywhere.
Aside from that I don't worry, my being alive is more important than people's delicate ignorant sensibilities. :)
People can be horrible, you just keep on injecting and managing your diabetes well. :)
I inject wherever I am, it's so important that I don't care about others sensibilities when it comes to it I'm afraid! With the modern pens you can barely even see a needle.