Several things. One, though this may seem initially astonishing, pros are people. Some people are dicks. As such it is all but inevitable that some pros are in fact dicks. That said, most of the pros I've met are incredibly down to earth and friendly, they may just not always be in the mood to be harassed because again they are but people and it is not difficult to imagine that they might sometimes like to go about doing whatever they are doing without said harassment. I do not wish to imply that there are no pros who are dicks but I would like to caution that deciding they are dicks based on one encounter with them that might not be at a great time for them is pretty damned unfair.