Self expression is all well and good, but when participating in a discussion, we'd all be much better served if you didn't hurl offensive and ungrounded insult

Self expression is all well and good, but when participating in a discussion, we'd all be much better served if you didn't hurl offensive and ungrounded insults at large segments of the population. Curmudgeonly is one way to put it; immature and ignorant is another.