I'd like to whack her with the paddle!

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So, yesterday I went to play pickleball to get some badly needed exercise. The lady who is in charge of the group is quite old..She is at least 75..anyway, I don't go regularly..last time I went it was heaven as she was busy teaching some total newbies the game..and paid no attention to me..this time as no one was new..and I was the junior player she kept telling me what to do and critquing my performance the whole game! one thing I hate is a micromanager. She at one point said do you want me to shut up?? I felt like saying yessssss! I just wish she would find someone else to bug. I realize I may not be perfect but at this point, I would rather rely on other players to tell me if I am doing something wrong. I don't want her to prevent me from enjoying the game. How should I handle this if I go again? Just be upfront I guess..and if she is offended she is offended.