I'm not going to pretend to be happy for my sil getting engaged when we all know her relationship is a dumpster fire
Why do you think her relationship is so bad?
I don't want to get into the details, but we all know they have a lot of problems.
It's not very nice to make mean comments about people's relationships like that. They would be really hurt by your words.
I don't care. Those glasses make her look like a horse.
It's your SIL's life so she's free to decide who she should get married with. It's not your place to make such comments about their relationship. If she's happy with it, why do you care?