The most annoying bad habit in trying to help people.
To slightly rephrase: the most annoying habit is to not ask people if they want help before just offering it—and trust me on this—it is really fucking annoying to the person you’re theoretically trying to help.
A great tool for dealing with this annoying habit. Wait until your friend is done telling their story and then ask them “Are you venting or looking for advice?”
Listening without comment, followed by “what can I do to help?” works for me.