Mine don't get called ugly, but I have had this happen:
"Wow, a search dog? Cool! What kind of mix is he? Doberman?"
"Oh, he's not a mix. He's a Catahoula."
"Oh, okay! My brother has one of those. They're really stupid dogs."
".....Okay....."
"Yeah, my brother's is the worst. He can't teach him anything!"
"Right... Well, that's probably your brother, not the dog. Nice meeting you... I'm gonna go now."
"Wow, a search dog? Cool! What kind of mix is he? Doberman?"
"Oh, he's not a mix. He's a Catahoula."
"Oh, okay! My brother has one of those. They're really stupid dogs."
".....Okay....."
"Yeah, my brother's is the worst. He can't teach him anything!"
"Right... Well, that's probably your brother, not the dog. Nice meeting you... I'm gonna go now."