Re: Hurt by SIL’s opinion of me 
I think you shouldn’t be taking what you SIL says seriously. She’s obviously a very silly girl and was trying to agree with a guy in a throwaway type comment online, which doesn’t mean much to her. Be the grown up here, if it bothers you that much, speak to her about it but don’t let her know you’re angry etc - might be a good idea to find out what kind of guys she’s been speaking to.
I keep thinking the same thing. Your nick is very unfortunate.