I don't feel guilty. It's fair to be suspicious of someone who covers their face without context like cold weather or a medical mask (could be sick or concerned about getting sick). The trick or test is to ask yourself "Do I/would I become equally concerned if this person was in a different racial category?" If the answer is "No", de-escalate yourself. If the answer is "No", look for the other markers that are actually setting off alarms for you. It's not just covering the face. As others have pointed out there can be a variety of harmless reasons why people might do that. But look for how a person carries themself: where they keep their hands how they move their eyes. Or maybe you are just paranoid about hoodies in general, in which case you should try to develop a more holistic way of sizing people up.