Of course, different people have different ideas as to what oppression is.
This seems specific, did you have an example in mind?
If you think gay marriage has to be banned so your marriage is more "special" (I can't think of a better word), then it probably wasn't in the first place.
Maybe "more sacred"?
No. "If you need to use the oppression of others to justify your morals and beliefs, then you have morals and beliefs different than my own." Fixed it for ya.