It depends on the type of match. If it's just a casual match, I act much different then when playing a league match. For casual matches, I am much more verbal and do compliment my/our opponents often. During a league match, I will compliment a special shot and do talk a little bit during the changeovers, but not nearly to the level of casual play.
I try not to take it too seriously either way, but it's my competitive nature taking over during league play. And if I notice my opponent not wanting to talk, I respect their wishes.