Tinder anonymously shows the profile of people in your location based on the user’s filter criteria. If your close ones happen to have a profile on Tinder, they might cross your timeline and vice-versa. And if you fall under their filter, there is no way you can stop Tinder from showing your profile to them. This means there is no block option on Tinder. The only possible way to avoid this awkwardness is by swiping left on their profiles as soon as you see them on your account.