Neil Patrick Harris and The Young and the Restless actor Eric Braeden exchanged barbs after Braeden backed out of a guest appearance on How I Met Your Mother.
"Eric Braeden is a D-Bag," griped NPH, 37, on Twitter Friday. "The actor, (Robin's dad) agreed to a cameo, then last night bailed, saying the part wasn't 'substantial' enough."
Braeden, 69, fired back, telling in an Entertainment Weekly, "His choice of words bothered me."
"It seems to me like a young whippersnapper, having seen himself on a few covers, who's received a few awards, is now suddenly suffering from the first signs of hubris," he said. "I've been in the business for 50 years. I've seen people come and go and I'm still here."
Braeden said he "truly enjoyed" his first appearance on sitcom in 2008, but explained he's "exhausted" from recent hip surgery and, "I was not about appear on a show for two lines."
Three hours after his initial Tweet, Harris backed off: "Now I feel bad for the D-bag comment. Don't know the guy personally. I'm just fiercely protective of our show."