Guys not showing both cards, flipping cards onto community cards.

[Wongboy]

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Technically Player A should win the pot since he was the only player to table a valid hand. This would be a douche move by Player A, however.

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Technically Player B should win the pot in your example, as Player B was the only person left with a valid hand. This trumps any tabling. What would be a douche move is if A said "nice hand", B mucked first, and then A claimed the pot. Some rooms would give it to him, too.

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Agree with the douche move part (actually more of an ultra-douche move).

In my hypothetical, both players muck their cards. The difference is that Player A tables his hand first, and then mucks, while B never tables his hand before mucking. By tabling his cards, A laid claim to the pot. B never made such a claim.