Oh, That's Just Your Opinion

Today’s guest on Issues, Etc. was speaking about abortion and confusing objective claims with subjective claims. During the conversation the guest mentioned a bumper sticker which said, “Don’t like abortion? Don’t have one,” and indicated that this misses the point of the whole issue. He likened it to saying, “Don’t like slavery? Don’t own a slave,” or “Don’t like spousal abuse? Don’t beat your wife.”
I would glibly offer this statement in response to the original bumper sticker: “Don’t like life? Don’t conceive one.” One on the pro-choice side of the issue might say that this statement is too self-righteously derisive, yet the same person passing judgment on this response would likely not have the same opinion on the original statement. Why is that, do you think? Could it be that one’s right to reproduce and abort is morally acceptable, yet indicating one’s displeasure with such an approach is morally reprehensible?
I will agree that morality cannot be defined by personal opinion if humans are to co-exist and survive to tell the tale. Truly, if morality is defined by personal opinion, then Hannibal Lector is fully self-justified in consuming his victims. After all, they are rude and obnoxious and no one will miss them; in fact, he could be a hero. Oh, wait, there I go again being self-righteously derisive. . .