Believe me... I am getting older and speak my mind more than most. We did make a stink about it. It didn't embarrass them because they didn't speak English and they couldn't care less what we think. And the management would rather have a couple disgusted old folks than risk offending their core clientele. We haven't been back after eating their for nearly 20 years.
I am glad you spoke out.
Next time, watch if the busboy cleans the table with disenfectant. Video it. If no disinfectant, report the restaurant to the Dept of Health.