Greg, let's have a talk. I won't judge you with all the words swimming in my head because enough people are about to to get my sentiments across.
What I will say, however, is that what you are convicted of and are on probation for is a socially unacceptable action. A large number of people find what you did disgusting and offensive and lewd. The reason your coworker may have been offended or asked you not to brag is because she is one of that group.
You have a right to your pride, no matter of what you are proud. I do not believe you should be proud of something like that. If you don't see anything wrong with what you did, that's one thing. But if you really, truly don't understand why she would tell you to not be proud of that, I am at a loss.
The simple statement "you should not be proud of ____" means that the speaker does not believe your actions were right and that they believe that you should not hold those actions as some sort of honorific medal.
Please understand that. And don't assume your beliefs are vindicated because people who will flame you disagree with you.