Some people always look angry. It is just the way they look. Maybe they have a nearly permanent scowl, maybe it is the way they contort their face when they talk. Yair Lapid is an example of that to me - he seems to always look angry. Yaakov Asher always seems to look angry to me as well. Some people look angry, and some people take it further and act angry, and talk very aggressive and violently. Yitzchak Pindrus often looks angry, or on the verge of anger, but he seems to be extreme with his anger and his approach to things he doesnt like.