I have always had the highest respect and admiration for Controllers and the work that they perform. In the busiest airspace they do a remarkable job. In an emergency, they can be a life savers. And what many young pilots do not understand/know yet is that their profession has had just about as much b.s. in it to contend with as our own careers have had. They have been screwed, underappreciated, scrutinized and more in their profession as much as we have over the years.
I have always viewed ATC as part of the team that makes me able to do what I do and do it safely. Some pilots too quickly forget this. Be as patient, courteous, cooperative, understanding and pay as much attention to them as you desire the same treatment inkind from them. When you can, visit a tower. (I understand this used to be much easier and thankfully I took every opportunity to do so over the decades) Learn about their work. You will be impressed. And thank them.