Even though I'm in Canada, my family is very British. They take every opportunity to take a poke at me, then expect me to do the British "stiff upper lip" thing.
They don't much like it when I poke back. They have since stopped poking me!
Because I know what my family is like, I'm gonna assume yours is similar. As are your friends, and co workers.
You can do what I did, and start poking back, and see how they like it, or you can ask them to stop, that it annoys you.
Poking back is the most fun, tho.....
Let us know how it goes....