I don’t think it’s any more cut and dried than being a republican, democrat, conservative or liberal. Actually, liberals fall more into the mindset you described than any libertarians I personally know. Most libertarians I know do want a strong national defense, they simply don’t want to be nation builders and perpetual occupiers. As far as social issues, that varies from person to person, some being extremely conservative, some believing each person should answer their own conscience. I don’t know any who thinks every thing or any thing a person chooses to do is OK, or that morality is a non-issue. Quite the opposite.
To say every libertarian is identical to every other one, and none of them have a conservative position on any issue is indeed the same as saying that anyone who opposes obama is a racist.
No one has said anything like you claimed, yet you keep repeating it, libertarian is an ism opposed to conservatism, and which at this point is joined with rinoism, to move the GOP left on many issues, such as the social issues.
If one tells us he is libertarian we know what that means, and we know that means he rejects conservatism, and opposes it.