Look up Appeal to Authority. You set yourself up as an authority by virtue of some 20 years experience then voiced opinions based on that experience. You don't need to call yourself an expert. The mere mention of vast experience is enough to influence others.I do have a couple of dozen years' experience in radio, true. I never said that makes me an "expert". That's not how I roll.
Fallacy of Assumption?
That's not what an Argument from Authority fallacy is.
Appeal to Authority (as a fallacy) means the arguer falsely identifies himself as an authority. Not that he is one. If the latter were the case, qualifications would have no meaning, there could never be an expert witness in court, and no study could be legitimate.
No. Appeal to authority is using your or somebody's credentials to support a point of view. If you are indeed an authority on the statement you make or if somebody else of authority can support the statement based on education or other qualifications, then there is no logical fallacy.
The logical fallacy comes in when you cite your media experience as your authority for being able to judge Rush Limbaugh's motives for creating a controversy, specifically the Sandra Fluke bruhaha. (Which brings us back to the content of the OP.) And you did do that.
First it is absurd to think that Rush intentionally would upset his advertisers and/or listeners with a truly offensive politically incorrect analogy. Once he got into it, he was stuck, and he did apologize for it later. But as Glenn Beck said in his defense of his nemesis, Liz Winstead, when she made an off the cuff offensive remark, there are none of us who have not made an extemporaneous comment in jest that we would like to take back. He defended Jeremy Linn for a sporting 'racial slur' in the same way.
In my heart I don't think it was Rush's intent to call Sandra Fluke a slut. His intent was to call women who expect others to pay for them to have sex 'sluts'. And in the process it came out sounding like he had targeted Fluke. It doesn't excuse it because I don't think he should be calling anybody sluts. But when anybody on the left is criticized and then forgiven for saying far worse, fair play suggests those on the right should be afforded the same slack. Rush doesn't have a mean spirited bone in his body that I can see, but he definitely does have a flare for poor taste.