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The way some acts here as if their acceptance of others requires the cancellation of their selves and the dissolving of their identity is far from sounding like a healthy thing. Who said that Christians because they are the majority shouldn't celebrate Christmas? I think that the situation is as it is here because it is a reaction to the pull of the identity complex in trying to draw a definition line by isolating others. But things don't have to be hijacked by that complex. Naturally, a group of people may for example go out together because they like being together not because they want the isolation of others. 

A clearer line between the self and the world also needs to be recognized in order not to submerge one by the other. Both dissolving the self into the world and dissolving the world into the self are not healthy. While everything ultimately depends on the intention, the recent coffee shop issue can make one think of how printing merry Christmas on the cups and not allowing a Christmas tree inside, for example, could serve as examples for dissolving others and dissolving of the self respectively. The difference between the two situations is that the coffee cups go with the customer.