Whats a mistake people make that annoys you?
I am by no means an expert but a few things that personally annoy me and I see this more with commercial pet shops not perfessional breeders.
. Sponge in a water dish. It can harbour so many bacteria.
. Using metal teezers or tongs. Could break the fangs.
. Not doing the research and buying an old world for their first tarantula. Honestly when I was a teen I volunteered at a pet shop we had some sort of Baboon tarantula can't remeber the exact genus and a woman came in wanting to buy it for her son who had absaloutly no prior experience in keeping tarantulas.
. Holding your tarantula. They shouldn't be handled unless absaloutly nessesary.
. Rehousing. Unless there is a good reason to rehouse, constantly moving them can stress them out.