It was inappropriate and disrespectful, but hardly unique to republicans or to treatment of Obama, as suggested by Whoopi Goldberg on the View:
He was, you know, I was appalled, really, because what I've been feeling the last couple of months is that this disrespect, which started with I'm not going to have my kid listen to your State of the Child address has now evolved into this free -- incredibly disrespectful -- Now as much as I didn’t like Mr. Bush and as many jokes as I made, I cannot remember anyone, any congressman, senator, anywhere, sitting in that chamber while the president was speaking behaving like those gentlemen and folks behaved.
Democrats made disrespecting the office of the President an art form during the Bush administration.
The ladies on the view also made reference to the disrespect shown by Eric Cantor by using his Blackberry during the speech. I am only guessing, but it's quite likely that Eric Cantor was "tweeting" during the speech, as has become common from the House floor by congressman from both parties. Get with the times ladies..