Bit of an arsehole comment to make tbh. You have no idea of his situation so snide comments like this are unnecessary.
Yeah, it was flippant and off hand, but what is unnecessary is posting what you earn on a punters website. At best it is of little relevance. At worst its barmy and a piece in the puzzle for a wannabe Sherlock.
If he'd have said, "thats a big proportion of my wage!" or "I couldn't justify that on a week away!" or "that's my rent / mortgage / car / phone" or "thats as much as I'd spend on punts in 6 months" then there'd be no comment.
Also look at the other posts he's directed to a first time reviewer in this thread, one who has detailed he has social anxiety. We don't need to discourage anyone who may be able to share details of high end punts / longers bookings.