Then it’s even less appropriate for someone who disagrees with the Catholic teaching to call it a host, any more than it is right for me to refer to a pair of gay men as “married”. Not trying to be offensive - but one should not use words that do not mean what you want them to mean.
However, I bow to Campion's more accurate knowledge, and then you're right too, JenB, you could maybe say "altar bread" or similar, rather than "host".
Thanks, JenB. I learned something.