Happy birthday!
While it was rude of them to make that comment, especially since they don't know what your relationship with alcohol was like, I don't think you should take it personally. Many of us have said things we didn't mean while drunk, not considering the feelings of others. Rise above.
You should be proud of the fact that you stayed sober where many others would have given in to temptation. That shows dedication and strength. Keep the big picture in mind: your health, your sobriety, your wellbeing. You're doing great.