“Cry about it” is usually trying to pull a visible reaction out of you, so the strongest response is often shorter and calmer than the bait deserves. I would choose between a dry dismissal, a playful flip, a clear boundary, or no reply at all based on whether the person is joking with you or
Being told to shut up does not automatically call for a bigger insult. The strongest reply is usually the one that lets you keep your voice, keep the tone where you want it, and decide whether the conversation deserves another minute. You can answer with a quick refusal, a playful line, a firm boundary, or
Dismissive replies do not all shut down the same thing, and that is why one comeback does not fit all of them. The cleanest response starts by noticing whether the other person is trying to stop you from speaking, erase your contribution, mock your reaction, or dodge the effect of what they said. From there,