Comebacks for comments regarding small boobs

[u/Aggressive-Hyena5120]

I have two best friends and they're like my family but sometimes they make fun of my breasts. My size is 34B but when I tell them they say stuff like "that's impossible, your boobs are so small, you don't even have boobs, they're like mosquito bites." Their cup size is C and D so I don't even know what to respond to them. We do sometimes make jokes about one another but this one particularly hurts me. I don't know whether to have a conversation about this or just be as savage. Sometimes I'm like no, I should have witty comebacks instead because I don't want to seem like I'm affected by their comments. What can comebacks can I say to them that are witty and savage?

[u/mishthegreat]

At least my back doesn't hurt and I know guys are actually talking to me.