1. Ask you how your day was (or something along those lines) only as a vehicle for them to tell you about their day. I hate it when I can sense they are just waiting for me to finish talking so they can talk about themselves.
Like, come on, at least listen to what I have to say and pretend to care.
2. You’re telling them a story about something unfortunate that happened to you and rather than be empathetic, the first thing they say is something along the lines of, “You think THAT’S bad? This one time, I had this much worse thing happen to me, and – “
Super rude. It’s not a contest.
3. Checking their phone when I’m in the middle of a sentence, when there was no sound or vibration that came from the phone, without addressing it immediately afterwards and pretending like I never noticed.