Shouldn't Libertarians be considered and called "Liberals", as they are the opposite of the authoritarians?

What would be considered "classic liberalism" is best represented by the Libertarians..modern "Liberal" Democrats are more like Authoritarian Socialists.

the original french anarcho-communist libertarians or the freemarket-worshipping americans who stole the name?

the latter can be called "neoliberals"

Of course, having to obey the whims of the market is not really freedom

Yes, I agree. That word should be reclaimed.

lol bro libertarians are worse than anything the us has to offer 

we are classical liberals

Not really. Liberal is an ideology, Libertarian is a political party.