I would be annoyed too - especially since it's not really even a feedback comment, but more like a message to the seller. 

I rarely even look at my feedback profiles these days, so any buyer who thinks that's a way to get my attention is going to either wait a fair while, or be disappointed entirely (or both). JMHO if someone wants to tell a seller something, they need to contact the seller, feedback is for when they want to tell everyone else something. 😕