That's usually all we have to go on, Chey. There are too many people to know them all. Most we just see, maybe overhear a few words but usually just get a glimpse. Often not even long enough to read body language.
Don't feel bad for being judgmental. It's an inherited trait, trying to size this guy up. It's a defense mechanism passed down for millennia. Someone approaching? Quickly, do you know them? No. Are they friend or foe? Don't know. Start sorting quickly identifiable clues, How their dressed, what they might be carrying, yada yada yada.
You're alive because your line survived. Probably because they were good at sorting out friends and foes. You come by it honestly.
When you see the things you saw today and it doesn't bother you....then you've really got something to worry about.
