Well, you are right. However, I rarely express my opinions unless I am exposed to other, offensive, opinions first. If I have to listen to everyone around me expressing pro-State/anti-liberty opinions all the time why should I be the one expected to remain silent?
In other words, if you don't want to hear my libertarian opinion, stop being a statist dickweed. That goes for things you take for granted, like "public" schools, "laws", cops, politicians... whatever statist subject you choose to talk about in a less-than honest fashion. If you are going to speak positively about theft, coercion, and violation of rights you should expect me to point out that your opinion is awful when you support (or ignore) evil and give you the ethical alternative.