Or better yet, if he receives a poinsettia and does not want it because of religious factors — then just go ahead and give it to someone else - the gardener, your barber - someone else will enjoy and appreciate the gift.
Sorry, but you need re-education. Such an action could be construed as 'giving a Christmas gift'. That would be even more offensive to the Perpetually Offended Thinskins, than being merely offered one.
Such a suggestion might even provoke him to set fire...Oh; wait; I'm confusing this Perpetually Offeneded Thinskin with the other Perpetually Offended Thinskins.