Interestingly, you've decided to conflate two completely unrelated situations here! I can only guess at whether this is due to spending insufficient energy analyzing the situation, or simply motivated reasoning.

Either way, it's important to recognize here that drinking coffee is a personal decision with personal consequences. Social distancing during a global pandemic has some personal consequences, but the majority of effects are on society (e.g. other people). By drinking coffee, flatTheCurve does no harm to people they come into contact with. By going into public, a hypothetical citizen exposes everyone they come into contact with to increased risk of infection. With infection comes risk of hospitalization, lifelong debilitating conditions (specifically permanent lung damage and strokes), and even death.

Going out in public for non-life-sustaining reasons during a global pandemic is more similar to tying your grandmother to a chair and forcing her to play Russian roulette than it is to drinking coffee.