Kornheiser got all hot and bothered about cyclists taking up too much room on his precious roads and urged listeners to give them a "nudge" with their cars.
Armstrong, as you might imagine, wasn't too happy about this.
"Listening to Tony Kornheiser's comments/rant on ESPN radio re: cyclists. Disgusting, ignorant, foolish. What a complete f------ idiot," he tweeted early Thursday morning.
By afternoon, it seems the two had made their peace.
"Just off the phone w/ Tony Kornheiser who's very sorry 4 his comments re: cyclists. Going on the show 2morrow 2 discuss this w/ him," Armstrong posted.
It's been a rough month for the host, who was suspended by ESPN for two weeks after railing against the outfit choices made by "SportsCenter" anchor Hannah Storm.
Were Kornheiser's comments over the line, or is this just another case of people not having a sense of humor?