I don't think anyone has suggested that an abortion is better than plan B. :P Of course it isn't. I also don't think anyone has suggested plan B is a bad thing to take when you need it. However, as it is only 92% effective at best... it is not always a fall back plan, and that unprotected sex could still end in an abortion which could have been prevented if the man and woman had been responsible to start with.
Of course it's the person's own choice... but choice or not, it is still irresponsible to have unprotected sex, particularly as unless you've been tested for STDs (and not slept with anyone else since the test) you're putting others at risk as well as yourself.
And if you don't want people to know about your sex life, don't talk about it on a public forum thread!