This also includes behavior on the a/c.

Gate Lice (the best ones are those who try to board with F).

Paxs that stop upon deplaning for a number of stupid reasons not realizing that others may have tight connections and want to hit the bathroom and grap food along the way.

Fat paxs that somehow think that your seat should take some of their rolls of fat.

People screaming on their cellphone at the gate area (luckily a lounge membership avoids some of that problem).

The stupid automated TSA announcements, "the security level is orange".