I've refused to sell rabbits and tortoises to people who are clearly unprepared. My least favorite are the "we're getting this as a first pet for our 3 year old to teach them responsibility." Becuse I feel bad for the kids that their parents are so colossally ignorant that they'd think it was OK to give either of those types of animal to a child who can't possibly understand how to care for it.My ad for selling chicks or duckling clearly states 'unsexed'. Still get responses saying they want "girl chicks/ducklings' only.
Also wonder if other have refused to sell to someone. Had a buyer show up but during chat learned they didn't have appropriate food, housing or heat source, so I cancelled sale.