In poker, as well as in all aspects of life, there are good manners and conduct to be observed. Poker is a social game that involves many people. These people also have feelings and will be offended by bad manners. If you are not very good at poker etiquette, no one will enjoy playing with you, no matter how good a player you are.
It is bad manners to reveal or expose your cards while a hand is ongoing. Even though there are no specific rules against this breach of etiquette, some places may impose a penalty. Your hand will be ruled dead when you're not folding. Revealing your cards gives a poker player an unfavorable advantage over other players. If this happens, whether intentionally or not, the best thing to do is to apologize profusely and swear not to do it again.
Never react to what's happening at the poker table, no matter how badly things have gone your way. Even if you know that you could have acquired an excellent hand on a flop, don't let anyone else know how pissed off you are by banging your hand on the table and making stupid facial expressions. Just remain calm in the face of danger. Also, don't blame the poker dealer for your dismal game as they have no control whatsoever on what cards are dealt and over the outcome of the game.
Perhaps you have encountered those people who criticize or make snide remarks on your poker play. Don't imitate these lowlifes. They are just there to make your poker game (and your life) utterly miserable for you. Don't brag about your playing skills and how good a player you are, no matter how many poker games you have won in a lifetime.
Lastly, and just as important, is don't make comments about the hand when you're not in it. Not only is this a terrible violation of the rules, it is also a fine example of bad manners. So unless you don't want to be called a Neanderthal, simply zip your mouth. There are, however, a few notable exceptions. An example is when there is some difficulty in counting the chips. A poker player who didn't bet all their money at stake can count faster than those who made the biggest bets, so it's acceptable for him to declare the all-in.
Another example is when a poker player tosses an oversized chip and yells, "raise!" but no one hears him and the other players start calling the previous bet. Before trouble ensues, the player who is not in the hand is in a proper position to verify that the bettor actually said "raise!" An unbiased third party has more credibility to confirm that the bettor actually declared a raise than the person who made the bet.
So refine your poker table manners and you will no longer be known as another poker player, but as someone whom other people enjoy playing with.
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Learn the ins and outs of poker etiquette. Avoid becoming a Neanderthal when playing poker.