Yes, Barr has been and is a social conservative. That is one reason I like him.
What he advocates is opposition to abortion, same sex "marriage, etc at the STATE level. He voted for the Marriage Amendment (which nationalized the issue) when he was a Congressman from GA but since becoming a "libertarian social conservative", he refutes that vote the same way he refutes his vote for the Patriot Act and for the Iraqi War. He has grown and had the guts to leave the GOP and make himself a target. He is a STATES RIGHTER!!!!!
And yes there are elements within the LP who feel Barr made a coup and is a NeoCon plant. In hearing their comments and checking their past, I've found that most of these comments are coming from the anarchy part of the LP which IMO has stopped the LP from making major inroads in the past. Just a bunch of kooks.
BTW, I'm NOT a member of the LP. I'm an Independent, although currently registered in the GOP so I could vote for RP in NC.