At work I am constantly being made fun of, and also in my group of friends. While I know they are not doing it out of hate, how do I become witty enough to at least retort?

Haha! I'm sure if its a group of close friends, they are just teasing you because they like you as a friend and you always provide them with good, funny reactions!

I have been the subject of such teasing last time and I think I often tend to retort defensively by teasing another person, thus shifting the focus away from myself. Then, I became the person who teases other instead haha. However, now thinking about it, I do feel bad about doing so as sometimes the jokes might hurt the other person, even though it is for fun.

Nowadays, I tend to just make a joke out of myself for the fun of it and allow others to tease me. I know its all in the name of fun :)

Watch all seasons of Rupauls: Reading is Fundamental. You will get the hang of it ;)

https://www.youtube.com/watch?v=U96SRUTvmQo&t=291s

Watch american shows!!! Like big bang theory and the likes

Most clowns would be green with envy at you.

Because you can make people laugh without doing anything.

On a more serious note, laughing along is fine. Based on that I assume that it is harmless and not personal attack jokes.

As for tips. Well how do you teach someone to be quick witted and fast thinking.

I can only suggest you pay more attention and when the joke starts already be thinking of a response.

Practice makes perfect.

Or prepare a cue card. Blank.

Whip it out when it happens again.

Your friends are bound to ask what is that.

And you can say you wanted to prepare some replies but it's blank.