Catch 22. You feel you've been betrayed, yet can't discuss it without actually admitting to it.
Not sure what the "crime" was in our case, but in our case, things like working out??? C'mon. Don't tell me the only acceptable form of excercise for a JW is walking from door-to-door. We felt they were wrong and needed adjustment and wrote them off as foolish. In fact, felt most of these things were a matter of personal choice and tastes and for the most part, we were still playing by the JW rules.
But what if it's something more serious? Could have tried the ignorance approach if they didn't know for a fact you were guilty. Approach the speaker and tell him that some people think he was talking about you. Ask whether there is anything he can do to let the congregation know it wasn't you?
Now if they know you're guilty... Well, those sort of things go with the JW territory. If you got reproved or DFed, they're usually going to give a special needs talk about it. Supposedly under the guise that if one person is doing it, others are at risk, so they need to address it. Meanwhile, you may have been the only one who knew and you've already been dealt with. When I was a JW, it was usually a good way to find out why somebody got DFed. Wait for the next special needs talk. To me, it's all just a part of the unjustice that's part of their punishment process. Just as DFing is cruel, so are these types of talks as they only serve to publicly embarrass you.
It probably wasn't personal against you. It happens all the time when people are reproved/DFed.