My idea of being considerate of arachnophobia in this context would be similar to what you've done here wrt menstrual bleeding: no photos not behind a cut tag, and this sort of phrasing where the person is warned of what's coming, not "So I met my friend for dinner at the SPIDERS! Big TARANTULAS! local Chinese restaurant, and we had a nice chat about our jobs and solved SPIDERS! the world's problems."