Guys question only?

Question

When you see another guy for the first time who is your partner in something, what gives you the first idea about him like what will make you like him from the first place or what could make you hate him?does his looks count ie angry, cute...
(its not a gay question, just want to know your first impression about different people)

Answer 1

His expression; the way he responds verbally and physically to various stimuli are what make my subconscious decision for me.