I am a libertarian (anarcho-capitalist) but people do not know the differences and similarities to liberal, because both has the prefix "liber".

Both ideologies evolved from the same source of classical liberalism, and still share plenty in common today.

But liberals would definitely down-vote me if I talked about Rothbard and Mises. Why do you think that is?

Because they have a difference in opinion with you about the degree to which markets should be allowed to exclusively allocate resources?

I personally am in favor of free market. Are they? I do not shy away from being a minarchist either, to be honest.

For what it's worth back, a lot of the opposition towards "establishment libs" is based more on optics than policy IMO.

Voters feel ripped off by the establishment. Running on "we're the establishment and we're here to help" is a loser, and letting Trump be the rebel is malpractice.