It is if you hate freedom
If you love freedom and liberty, you should be overjoyed at the prospect of a whole group of people being liberated from the threat of discrimination
Maybe you should be overjoyed at the prospect of reinstituting slavery, since a whole group of people (slaveowners) would be 'liberated' from having to work.
Spend less time arguing about how gays should not be included, and more time about how the entire "anti-discrimination" thing should be abolished.
Or you could keep pretending to be a Libertarian, if you want.