We should all express ourselves freely i agree, but sometimes our opinions may cause hurt and pain to other people. eg(You think sum1 is a gay pratt, and you tell him, of course he aint gonna take it lightly, you would be lucky to get away with a black eye) Therefore there is an extent to which individuality can go without discriminating against other people.
This should eventually lead us to tolerance of other peoples individuality, and if this was done problems such as sexism,racism etc wouldnt exist.