Have you ever noticed that those who complain about dogmatism, intolerance and closed-mindedness are often the ones who most exemplify these characteristics? I've been accused of each of these, no matter how polite I am during the course of a debate.
For example, I've been accused of being intolerant for publicly expressing my belief in moral objectivity. The funny thing is, the accuser cannot decry my intolerance without himself/herself presupposing moral objectivity. If what's right for me isn't necessarily what's right for another, then the accuser has lost all grounds for his objection. Why not be intolerant? After all, if morality is relative, then why bother complaining about what's best for me? The moral relativist's position is therefore self-defeating.
Is my claim that homosexual behavior is unhealthy merely my own subjective opinion, and not one that I should publicly express? Taken to its logical conclusion, I guess I also shouldn't publicly express that the consumption of rat poison is unhealthy. The fact is that nobody is a moral relativist or nihilist in practice. The only consistent position with one's belief and one's practice is moral objectivism.