There are 50 total patrons. 16 like lattes, 12 like espressos, and 8 like both drinks.
Add the two totals for patrons that like either lattes or espressos:
![16 + 12 = 28](https://img.qammunity.org/2019/formulas/mathematics/college/l241pjm4vxmq5bs0m62c0hm2ro845wxe8t.png)
8 patrons like both drinks, so subtract this from the amount of patrons that like either drink:
![28 - 8 = 20](https://img.qammunity.org/2019/formulas/mathematics/college/tpaht4sber4nm531wjphssgly5fptx3qgv.png)
20 patrons like at least one drink.
Subtract the amount of patrons that like a drink from the total amount of patrons:
![50 - 20 = \boxed{30}](https://img.qammunity.org/2019/formulas/mathematics/college/3h6fzk3va4k69jufv7v77auyh0l7obzy3j.png)
30 patrons like neither drink.