I think they were intended for a little bit of fun, but some players use them to try and insult other players to put them on tilt, like giving some one the tissues when they lose an all-in situation, I find them hilarious and some times a little childish, so they don't bother me that much.
PKR.com had emoticons you could have your avatar say to other players like "Loser" and the avatar would even use the right thumb and forefinger to show the table the "L" on the forehead, it was all a bit of fun but over used it could offend some players.
I grinded up a $150
bankroll from nothing on PKR from
freerolls and then 10 cent buy in SnGs, mainly because it did not get to me, and it was easy money.
When the fun Stops, STOP!