No not everybody.
Only those with limited dialogue skills.
ETA : I forgot 'Intellectual Laziness'.
I consider that to be nonsense.
There are many occasions when somebody has posted something I have feelings about and merely wish to use an icon rather than getting involved with a person whose only pride is in always having the last text where others are concerned. Hence I can sometimes use an icon to indicate what I feel about that particular argument/comment/phrase/text.