I don't see a problem with being offended by what a standup comedian might say, as comedy can be weaponized, and used as a mask for deep hatred, or some other intention to brainwash a stupid audience. How stupid do some of these "comedians" think we are? That's what's so offensive.
Bill Cosby thought we were really stupid, and still does. Snoop Dog thinks we are stupid. So when Snoop Dog roasted Donald Trump a few years ago, along with several other unfunny "comedians", i didn't think it was funny, and wanted to push a reset button when comedians really knew how to roast, back when Dean Martin, and friends, were roasting each other, especially Don Rickles.
There's a big difference between a Colbert, and a Don Rickles. Colbert really HATES Trump. Rickles could manage to insult anybody, without actually hating them, or coming off as hating them.
It's this hatred that get's people like Colbert in hot water, as they manage to insult large swaths of huge demographics, just to get a zinger into one man.
It's low-brow brow-beating. Neanderthal. Brainwashing. Weaponized stupidity.
It's offensive to be given such a graphic image of something you know isn't true.
That's what the lying media has been doing. That's what's offensive. How stupid do they think we are?
Basically, he's saying, I want you to hate Trump as much as i do by finding a dishonest graphic image funny, using a dishonest delivery (opinion/propaganda disguised as comedy), as i shove it into your brain like a dumpster in a stinking alley.