[markksman]

I think your example makes the guy a major tool.

You deserve what you get if you fall for it, but it doesn't make the guy who did it any less of a tool.

That is clearly an unethical move. I don't know how you could see it otherwise. There is no need to do that. If you did not play good enough to get them to lay down before the showdown, or you did not have a winning hand, tough.

Have some respect for yourself and for other people.