They don’t CARE about the facts or how absurd their claims are. Also pet eating is something that, in times past, was a racist slur foisted onto Asians, like Chinese restaurants who cooked cat instead of beef or chicken, and more specifically Koreans, who did consume dog meat sparingly, but that was something that happened historically it was never common and dog meat consumption is actually illegal now in South Korea, and eating dog meat has been in rapid decline for decades anyway.
Seeing Haitians get called pet eaters is actually a very new thing.