She also posted other "get a job" stuff, so the main thrust of it wasn't about my studies. I'm not sure if I posted her other comments, though. Every time I posted something that I achieved, she'd twist it into me not having enough work.
If I'd known she would've been offended, I would've hidden the picture from her in the first place. I don't typically set out to offend people.
Even if I'd known that she was a Christian, though, I wouldn't have realised that she'd take offense, as I used to laugh at pictures of that nature back when she was a Christian.