Yuri,
I do not think that way about professionals. There is variety among them as there is among any group, but, PHD's have earned the credentials necessary to speak as authorities. Their responsibilities as extensive and time consuming. Even cordial replies sometimes must wait. They face a difficulty in responding to non-professionals.
If they respond at all the chances are the correspondence will become prolonged and usually for no good reason. The worst thing they can do is try to be diplomatic. Most non-professionals, who are always swarming to contact the professionals, take politeness as an invitation to teach the professional. Surely you know that almost all non-professional evaluations of theoretical physics are clearly wrong.
If the professionals are honest in their evaluations, they are often treated disrespectfully. When they can and do give of their time and their opinion it should be accepted gracefully. Wait and while waiting don't use words like 'arrogantism'. If you don't receive a response then try somewhere else. I say this as someone who is occasionally treated disrespectfully and censored by professionals.
Appreciate that you have the chance to rub elbows with professionals. If that is all you receive from some, it is more than you will receive elsewhere. It should be clear to you and to all that I have been around the Internet for many years and there is no place better to have a chance to say what one thinks scientifically than exists here.
This is the only place that I converse with professionals other than if they contact me first through email. I never contact them elsewhere. If they see something I say as deserving a compliment, there are some who would and have stepped forward and said so and I thank them for that.
James