Indeed. I suspect most of them are just bitter Steve L-O-N-E-G-A-N supporters who can't get over the fact the "RINO" Christie beat their conservative icon, so trash him when he does their bidding and fights for conservative values.
Ideally they'd rather have the NJ union thugs back in power than a guy who agrees with them 80% of the time. Christie isn't a perfect conservative by any means but he is 1) The most conservative governor NJ has had in decades and 2) One of the most gutsy Republican governors in America right now.
Since he got elected, their tactic has been to scream "RINO!!!" at him regardless of what he does, and they've been insisting since he won the GOP nomination that he's an evil closet liberal and no different than a Democrat. The problem is that he far exceeded expectations and has governed much more conservatively than people expected (even Rush Limbaugh is a huge fan of Christie now!), so now they just have to flat out lie and make up stories about him being "pro-abortion" and "pro-gay marriage", so he'll fit the "RINO" stereotype better.
At first I gave them the benefit of the doubt and figured some Christie bashers were just plain ignorant and didn't realize he publicly professed to be a socially conservative devout Catholic, but after he cut off funding for planned parenthood in NJ and vetoed the legislature's attempts to foist gay marriage on the state, the Christie haters here kept on screaming "socially liberal RINO!!" at him on every thread. Pretty much they'll keep smearing these lies regardless of his record. At this point their tactics are no different than I were to falsely accuse Rick Perry of being "anti-Israel" on every Perry thread because I don't like the guy.
I've noticed they really don't like being drawn into a conservation about their "socially liberal RINO" premise, because they can't back up their smears with evidence, so you're right, they'll change topics and start grasping at straws, talking about other issues that have nothing to do with social policies, make fun of his weight (just like liberals do), and just keep repeating endlessly that he's a RINO and anyone who disagrees is a RINO too and loves liberals. Occasionally they'll bring up a legitimate weak spot on his record, like the fact he endorsed some RINO, and state that it disqualifies him for ever getting conservative support. Of course, when one of their heroes like Sen. John Thune has an even worst record on the issue and has endorsed about a dozen odious RINOs in GOP primaries, they're more than happy to tout him as veep material.
Ideally they want to end debate and get all conservatives to just accept the premise that Chris Christie loves abortion, gay marriage, etc. Sadly, they've fooled alot of conservatives on here into actually believing Christie supports that garbage, so much so that there would need to be a massive PR battle to spread the truth about Christie's actual record and beliefs if he were on the ticket. Right now I think conservative cannibals would do their best to destroy him, ESPECIALLY if he ran with Romney.
It's funny, when I'm on a Santorum thread and defend him, Santorum bashers claim all I care about is social issues, but when I'm on a Christie thread and defend him, the Christie bashers claim I don't care about social issues. Interesting.
As for the rest of FR, if you can't the difference between this... 
Republican Judy Baar Topinka at the Gay Pride Parade
and this...
Republican Chris Christie at the NJ Right to Life Rally
... you need your eyes checked. I know what "socially liberal RINOs" are and I don't support them. Chris Christie isn't in that camp.