Even if that's the case, the vast majority of his post was about what he perceives as an effective way of judging play. Making any conclusions about Sean's ability to do so was entirely unnecessary. He could have simply made the point that the deck does not do enough in one of the established venues for creating a win and left it at that.
Believe me I would love to give him the benefit of the doubt on this, but it's also possible he worded it that way to get attention. That's not the sort of thing we should welcome or praise.
That said, the op is welcome to edit his remark to make it more friendly at any time. I'd be happy to edit my own responses and pretend this discussion never happened in such an event.