If your employer is asking you to be a supervisor then (if they are a good employer) they already respect you and are showing that by having the confidence that you can do the job well and instruct others to do so also. I've offered folks in the past supervisory level and they have turned them down for numerous reasons, I respected their decision either way and this had no adverse effect on my respect for them as people and the work they do.
Some people are just not cut out to supervise, some people maybe more than capable but don't want the extra responsibility, others are born to lead and excel in that position...But, beware, some people are useless at it but like the feeling of "power" the last thing anyone needs is a knob like that running the show!
Forcing someone to take a role they do not want to do, then making them feel guilty about not accepting is completely non productive. If you don't want to do it and you are doing the job on the tools well, your employer should respect that and find someone else to supervise.
Where I work your just seen as a pair of hands if you don’t want to run jobs. I am very very good on the tools. I have a lot of experience and do the job to a very high standard. But I struggle to supervise, order materials, sort out the job and then do a full days work on top.
I can do it but I find it stressful. Whereas I love being on the tools. And do a brilliant job.