Surfers, sailboarders, and kayaks tend to avoid being in the same place at the same time. Surfers REALLY dislike having kayaks among them for obvious reasons. Kayaks are (typically) under less control (since they don't cut as sharply or as well), have lots more mass, and continue to travel in the wave even after the capsize. Collisions between surfers and kayaks don't end well for the surfer.
Worse, most of us don't use or understand the surfer lexicon and hand signals, so lots of kayakers simply don't get the message. For this reason, many of them are shunned by the surfer community.
Sailboarders probably have a more comprehensive view of their surroundings than either kaykers or surfers. They have to look well ahead of them in order to plan and execute. They are standing, of course, which helps a lot. Because they are moving a whole lot faster, as you see in the video, they need to see further ahead to respond to conditions they will encounter. On the downside, that sail can block a lot of visual area, so if you are on the opposite side of the sail, you can't assume you'll be seen.
They tend to be more aloof than kayakers in this area. If talked to, I often get nothing more than a grunt in return. It seems that if you don't share their interest in the sport, they don't really seem motivated to interact. Kayakers seem to be much more gregarious (around here, at least).
This could stem from the amount of crap that surfers throw around to keep everyone off "their" beach. These folk tend to be much more territorial. A more surly lot I've seldom seen, though I can understand their safety concerns.
And yes, these gross generalizations are not to be applied to individuals, since there are lots of variations in human behavior, but the trends are there.
PFD's (Life Jackets)
Recreational Kayak Paddle
Deck Rigging Gear
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