Honestly, based on what's here, I think LW's first step has to be talking to Lynn directly. I also think LW may have better luck with that than he thinks!
Lynn complied with the request not to play Christian music without resistance, and I really don't think anything here suggests that Lynn had been playing the music deliberately to bother LW – she probably wasn't thinking about it. It's also true that there are plenty of LGBT Christians, and some of us even listen to worship music, so I don't think Lynn could have been expected to know she should avoid playing it specifically because of LW's sexuality. (Though playing it in the office of a non-religious org definitely isn't appropriate whether you have LGBT coworkers or not!)
LW doesn't say the niece lives with Lynn, so LW's assumption (probably correct) that the kid learned to say these things at home isn't evidence of Lynn's personal beliefs. LW says the kid says she's just joking, but nothing about Lynn's reaction – it sounds like Lynn likely doesn't even know what the kid is saying. Lynn's willing acquiescence to LW's previous request for her to stop playing Christian music because it made him uncomfortable as a gay man suggests to me that she'd probably tell the kid to knock it off – the kid's behavior is way more egregious and directly targets LW.
The interaction re: the worship music is the most direct evidence LW has to go on to predict Lynn's reaction if he were to tell her about the kid's behavior, and in that interaction he says Lynn "understood" when he asked her not to play Christian music in the office and didn't argue about it. That really suggests to me that she'd likely do something about the kid's behavior if LW brought it to her attention and asked her to deal with it.
no subject
Lynn complied with the request not to play Christian music without resistance, and I really don't think anything here suggests that Lynn had been playing the music deliberately to bother LW – she probably wasn't thinking about it. It's also true that there are plenty of LGBT Christians, and some of us even listen to worship music, so I don't think Lynn could have been expected to know she should avoid playing it specifically because of LW's sexuality. (Though playing it in the office of a non-religious org definitely isn't appropriate whether you have LGBT coworkers or not!)
LW doesn't say the niece lives with Lynn, so LW's assumption (probably correct) that the kid learned to say these things at home isn't evidence of Lynn's personal beliefs. LW says the kid says she's just joking, but nothing about Lynn's reaction – it sounds like Lynn likely doesn't even know what the kid is saying. Lynn's willing acquiescence to LW's previous request for her to stop playing Christian music because it made him uncomfortable as a gay man suggests to me that she'd probably tell the kid to knock it off – the kid's behavior is way more egregious and directly targets LW.
The interaction re: the worship music is the most direct evidence LW has to go on to predict Lynn's reaction if he were to tell her about the kid's behavior, and in that interaction he says Lynn "understood" when he asked her not to play Christian music in the office and didn't argue about it. That really suggests to me that she'd likely do something about the kid's behavior if LW brought it to her attention and asked her to deal with it.