Of course it is if you discriminate against them (or your church does) on the basis of their disability.
Ah.
But no church can accommodate every disability.
There are buildings I simply cannot enter, because the light quality actually hurts my eyes.
Is that the designer's fault when, in the fifteenth century, he did not take this into account?
If the theology of a church is offensive to someone, then that someone might want to found another one based, not on the Christian Scripture, but on whatever the current societal trend is.