

Dipping fries in mayo is something people do, which is pretty close to eating it raw, but I guess people eat liquorice too. Eating mayo raw would be something I don’t want to do, while I wouldn’t mind at least trying salmiakki. If I saw someone eating spoonfuls of mayo I’d definitely judge them more than if they were eating liquorice.
I don’t think it makes you an asshole, it just means you’re not that interested in seeing her or really don’t like kids. Probably a combination of both. There’s nothing inherently wrong with either of those things.
If the kids are the dealbreaker then your options are 1. Decline and lie about why, 2. Decline and tell her why, 3. Just suck it up and do it to save face. Personally I think 1 sounds unnecessarily complicated and you should just do whichever you prefer of 2 or 3.