There are people who hang up the phone as you are talking to them, cutting you off in mid-sentence. There are those who don't say hi when they answer the phone and know it is you -- they say "mmm" (HOWW ruuude) and then those who hang up without saying bye.
Also, don't like those who respond to your phone 'hi, are you busy?' with a resigned 'Tell me'. That's lukewarm, to say the least. May as well say 'yes, bit busy..later?'
Then there are those who laugh noiselessly. Worse, there are those who shake their shoulders on pupose while laughing, supposedly to convince others that they are indeed laughing. Annoying habit.
Many hide whatever they are feeling with laughter and happy talk. Heck, I do that myself sometimes.
Then come those who laugh at their own jokes...alone. Nope, I ain't one of them...yet! But the world is getting weirder and weirder by the day that I consider often, of going with the saying: If you can't beat 'em, join 'em'.