Yup getting outted and hen pecked by a family member has got to go a long way to making you feel squicky and even maybe reduced to child status for having to defend things that was never suppose to be their business in the first place. What would this person blame it on if you and your partner DID have a relationship blow up and they didn't have this easy and waiting scapegoat to hassle you with? Are they usually this much of a busybody to the rest of the family?
I too, for coming from a very strict religious family, use to fear their judgement. Not anymore though. Kinda hard to get me there now since it took so much less "radical" behavior out of me to get them to disown me outright. All I had to do was not believe and not be politically conservative.