As much as I understand and support the sentiment, destroying things that are still functional is a very republican action.

Perhaps deface the mugs (sharpie marks generally survive dishwashers and can be reapplied later for new fun mustaches) and turn the shirts into dishrags or washcloths. (especially fun since in languages with gendered nouns, like German for example, a shirt is a neutral gender and a washcloth is masculine, thus making this really transformational.)