I don't see how you can make this claim? What exactly do you think the rodeo clown was trying to say other than he dislikes (or dare I say hates) Pres. Obama? Frankly, I find it very cowardice for people to hide behind "free speech" when all they've done was show blatant disrespect for the President of the United States no matter who he is or from whatever political party he affiliates.
To this claim that "liberals" get all butt-hurt whenever anyone from the opposing party challenges a claim of being disrespectful towards "their" President, I think people know bad behavior when they see it. But for the record, I don't consider myself a liberal nor a Democrat although I do identify more with the Democrat Party than I do the Republican Party. I like to think I can see the good and the bad within both parties. I take the better qualities of both and try to shape my ideology around those issues. For example, I don't like the continuous dependency on social programs by some segments of the population, but I can understand how many people would struggle to have their survival needs met without these programs. I think we as a nation can met the needs of those in need without maintaining a revolving door to such benefits. Nevertheless, I call inappropriate behavior what it is no matter what side of the political divide the behavior stems from. For example, when the Iraqi tossed a shoe at GWB during a press conference he held in Iraq, I thought it was disrespectful. Moreover, it was dangerous! What if it had been a knife instead? I may not have liked him much as President, but I certainly didn't want to see him get hurt. And that's where I'm coming from with this clown issue.
He may have been attempting to convey to the crowd his displeasure with President Obama, but he could have shown it in a much more appropriate way. This wasn't a man trying to be funny. This was a man trying to stir the crowd to anger. This wasn't a man making jokes. This was a man attempting to mock the President of the United States. No matter what he may have thought of his policies or the direction he believes the President is taking the country in, there are better more appropriate ways to be funny yet not be disrespectful of the President of the United States.
As an aside, between 1976 and 2004 I really wasn't as into politics during that period as I am now. Of course, I had so many other things taking place in my life back then - finishing high school, serving my country on active duty in the Navy, taking care of my young family, etc. But since 2004, I've paid closer attention to the political wrangling of the day, and I must admit I don't like the hyper-partisanship I see every day. I've often wondered why can't a person simple call out a wrong without being labeled a liberal whinny-ass or a conservative blowhard?