My in-laws came over today, as they do every Tuesday.
My son, who is 3 next month, grabbed a wooden knife from his play kitchen and said "I'm going to cut you, nanny!" to my MIL. My MIL fled to the kitchen in tears. I sat him down, explained that it wasn't a nice thing to say and told him to say sorry. I thought that would be the end of it but MIL was in a mood for the rest of the day and was honestly quite horrible to my son after, being snappy and telling him off a lot more than usual.
AIBU to think this was a massive overreaction and while it was a horrible thing to say (I've no idea where he got it from!), he's 2 so doesn't understand?! They're looking after him this weekend and I'm worried she will still be upset with him.