We all need to be a little nicer, and at the same time, we all need to be a little thicker-skinned. Just because one or two people expressed themselves (rather unkindly, btw) in an unflattering fashion, does not mean that others are in agreement.
Whether you are a teen or a middle-ager like me (or much older), if you express yourself respectfully, you have a right to do so. Who cares if someone disagrees with you, or some smart aleck says what he or she thinks is hilarious, but is nonetheless negative in your eyes? Let it roll off your back, and don’t let it prevent you from exercising your ability to express your opinion.